diff --git a/infra/config/recipes.cfg b/infra/config/recipes.cfg
index da5d880..2593418 100644
--- a/infra/config/recipes.cfg
+++ b/infra/config/recipes.cfg
@@ -25,17 +25,17 @@
   "deps": {
     "depot_tools": {
       "branch": "refs/heads/main",
-      "revision": "9a7b7675babf0873ca1fd5d38d122b1f964feaab",
+      "revision": "5b13afcae350b04c4c21de1afe17dd45c7e0b2b1",
       "url": "https://chromium.googlesource.com/chromium/tools/depot_tools.git"
     },
     "fuchsia": {
       "branch": "refs/heads/main",
-      "revision": "7beb075d6f65aba158f3881455746af459475758",
+      "revision": "a0ef93ddc574f0ff9733d2fbbaefd062b8d11c28",
       "url": "https://fuchsia.googlesource.com/infra/recipes.git"
     },
     "recipe_engine": {
       "branch": "refs/heads/main",
-      "revision": "f2754bcd62e3ac64580dedbe306b5ef519e44614",
+      "revision": "4cb1bf0fb0cb3c59f56399aa92a6c7956ef20e41",
       "url": "https://chromium.googlesource.com/infra/luci/recipes-py.git"
     }
   },
diff --git a/recipe_modules/android_virtual_device/examples/full.expected/demo zombie processes.json b/recipe_modules/android_virtual_device/examples/full.expected/demo zombie processes.json
index 17eba84..aa42676 100644
--- a/recipe_modules/android_virtual_device/examples/full.expected/demo zombie processes.json
+++ b/recipe_modules/android_virtual_device/examples/full.expected/demo zombie processes.json
@@ -66,7 +66,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/builder/avd/src/tools/android/avd/avd.py",
       "install",
       "--avd-config",
@@ -98,7 +97,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/builder/avd/src/tools/android/avd/avd.py",
       "start",
       "--no-read-only",
diff --git a/recipe_modules/android_virtual_device/examples/full.expected/demo.json b/recipe_modules/android_virtual_device/examples/full.expected/demo.json
index 8c92b6f..bfcaadb 100644
--- a/recipe_modules/android_virtual_device/examples/full.expected/demo.json
+++ b/recipe_modules/android_virtual_device/examples/full.expected/demo.json
@@ -66,7 +66,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/builder/avd/src/tools/android/avd/avd.py",
       "install",
       "--avd-config",
@@ -98,7 +97,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/builder/avd/src/tools/android/avd/avd.py",
       "start",
       "--no-read-only",
diff --git a/recipe_modules/bucket_util/examples/full.expected/basic.json b/recipe_modules/bucket_util/examples/full.expected/basic.json
index 21f08b8..f0d7e7d 100644
--- a/recipe_modules/bucket_util/examples/full.expected/basic.json
+++ b/recipe_modules/bucket_util/examples/full.expected/basic.json
@@ -2,7 +2,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "Zip build",
@@ -24,7 +23,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "Zip build (2)",
@@ -46,7 +44,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "Zip build (3)",
@@ -68,7 +65,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "zipping",
diff --git a/recipe_modules/bucket_util/examples/full.expected/upload_packages.json b/recipe_modules/bucket_util/examples/full.expected/upload_packages.json
index 7a83d9e..7338256 100644
--- a/recipe_modules/bucket_util/examples/full.expected/upload_packages.json
+++ b/recipe_modules/bucket_util/examples/full.expected/upload_packages.json
@@ -2,7 +2,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "Zip build",
@@ -51,7 +50,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "Zip build (2)",
@@ -100,7 +98,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "Zip build (3)",
@@ -149,7 +146,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "zipping",
diff --git a/recipe_modules/bucket_util/examples/full.expected/upload_packages_experimental_runtime.json b/recipe_modules/bucket_util/examples/full.expected/upload_packages_experimental_runtime.json
index 3f09103..bdf2878 100644
--- a/recipe_modules/bucket_util/examples/full.expected/upload_packages_experimental_runtime.json
+++ b/recipe_modules/bucket_util/examples/full.expected/upload_packages_experimental_runtime.json
@@ -2,7 +2,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "Zip build",
@@ -42,7 +41,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "Zip build (2)",
@@ -82,7 +80,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "Zip build (3)",
@@ -122,7 +119,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "zipping",
diff --git a/recipe_modules/bucket_util/examples/full.expected/upload_packages_if_commit_is_present.json b/recipe_modules/bucket_util/examples/full.expected/upload_packages_if_commit_is_present.json
index 6014cb7..a6bb49e 100644
--- a/recipe_modules/bucket_util/examples/full.expected/upload_packages_if_commit_is_present.json
+++ b/recipe_modules/bucket_util/examples/full.expected/upload_packages_if_commit_is_present.json
@@ -2,7 +2,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "luci_context": {
@@ -99,7 +98,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "luci_context": {
@@ -196,7 +194,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "luci_context": {
@@ -293,7 +290,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "luci_context": {
diff --git a/recipe_modules/web_util/examples/full.expected/chrome driver.json b/recipe_modules/web_util/examples/full.expected/chrome driver.json
index d902203..c0ddb98 100644
--- a/recipe_modules/web_util/examples/full.expected/chrome driver.json
+++ b/recipe_modules/web_util/examples/full.expected/chrome driver.json
@@ -29,7 +29,6 @@
   {
     "cmd": [
       "vpython",
-      "-u",
       "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
       "--yaml_file",
       "[CACHE]/builder/src/flutter/lib/web_ui/dev/browser_lock.yaml",
diff --git a/recipe_modules/web_util/examples/full.expected/chrome.json b/recipe_modules/web_util/examples/full.expected/chrome.json
index 6666a54..0a40d38 100644
--- a/recipe_modules/web_util/examples/full.expected/chrome.json
+++ b/recipe_modules/web_util/examples/full.expected/chrome.json
@@ -29,7 +29,6 @@
   {
     "cmd": [
       "vpython",
-      "-u",
       "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
       "--yaml_file",
       "[CACHE]/builder/src/flutter/lib/web_ui/dev/browser_lock.yaml",
diff --git a/recipe_modules/yaml/examples/full.expected/passing.json b/recipe_modules/yaml/examples/full.expected/passing.json
index 53ac5e3..ad568cd 100644
--- a/recipe_modules/yaml/examples/full.expected/passing.json
+++ b/recipe_modules/yaml/examples/full.expected/passing.json
@@ -35,7 +35,6 @@
   {
     "cmd": [
       "vpython",
-      "-u",
       "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
       "--yaml_file",
       "RECIPE[flutter::yaml:examples/full].resources/sample.yaml",
diff --git a/recipe_modules/zip/examples/full.expected/linux.json b/recipe_modules/zip/examples/full.expected/linux.json
index b51ee3d..b31542d 100644
--- a/recipe_modules/zip/examples/full.expected/linux.json
+++ b/recipe_modules/zip/examples/full.expected/linux.json
@@ -38,7 +38,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "zipping",
@@ -47,7 +46,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "zipping more",
@@ -63,7 +61,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/unzip.py"
     ],
     "name": "unzipping",
diff --git a/recipe_modules/zip/examples/full.expected/mac.json b/recipe_modules/zip/examples/full.expected/mac.json
index b51ee3d..b31542d 100644
--- a/recipe_modules/zip/examples/full.expected/mac.json
+++ b/recipe_modules/zip/examples/full.expected/mac.json
@@ -38,7 +38,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "zipping",
@@ -47,7 +46,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "zipping more",
@@ -63,7 +61,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/unzip.py"
     ],
     "name": "unzipping",
diff --git a/recipe_modules/zip/examples/full.expected/win.json b/recipe_modules/zip/examples/full.expected/win.json
index 294324d..46d73bb 100644
--- a/recipe_modules/zip/examples/full.expected/win.json
+++ b/recipe_modules/zip/examples/full.expected/win.json
@@ -38,7 +38,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "name": "zipping",
@@ -47,7 +46,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "name": "zipping more",
@@ -63,7 +61,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\unzip.py"
     ],
     "name": "unzipping",
diff --git a/recipes/cocoon/cocoon.expected/pull_request.json b/recipes/cocoon/cocoon.expected/pull_request.json
index cee43a8..da65d4a 100644
--- a/recipes/cocoon/cocoon.expected/pull_request.json
+++ b/recipes/cocoon/cocoon.expected/pull_request.json
@@ -250,7 +250,6 @@
   {
     "cmd": [
       "vpython",
-      "-u",
       "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
       "--yaml_file",
       "[START_DIR]/cocoon/tests.yaml",
diff --git a/recipes/engine/engine.expected/Linux Fuchsia failing test.json b/recipes/engine/engine.expected/Linux Fuchsia failing test.json
index 6a1c385..8ebef36 100644
--- a/recipes/engine/engine.expected/Linux Fuchsia failing test.json
+++ b/recipes/engine/engine.expected/Linux Fuchsia failing test.json
@@ -1742,7 +1742,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -1789,7 +1788,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/clobber.json b/recipes/engine/engine.expected/clobber.json
index c88cfbb..8845b59 100644
--- a/recipes/engine/engine.expected/clobber.json
+++ b/recipes/engine/engine.expected/clobber.json
@@ -2867,7 +2867,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3410,7 +3409,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3456,7 +3454,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3544,7 +3541,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3680,7 +3676,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3909,7 +3904,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3997,7 +3991,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4085,7 +4078,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5647,7 +5639,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5735,7 +5726,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5823,7 +5813,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5911,7 +5900,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6983,7 +6971,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7031,7 +7018,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8103,7 +8089,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8151,7 +8136,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8239,7 +8223,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8817,7 +8800,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8905,7 +8887,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9483,7 +9464,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9571,7 +9551,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10149,7 +10128,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10237,7 +10215,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10772,7 +10749,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12177,7 +12153,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12597,7 +12572,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12691,7 +12665,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12785,7 +12758,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12883,7 +12855,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12977,7 +12948,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13071,7 +13041,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13353,7 +13322,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13447,7 +13415,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13541,7 +13508,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13639,7 +13605,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13733,7 +13698,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13827,7 +13791,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14109,7 +14072,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14203,7 +14165,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14297,7 +14258,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14395,7 +14355,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14489,7 +14448,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14583,7 +14541,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/experimental.json b/recipes/engine/engine.expected/experimental.json
index 8671ab7..289a66f 100644
--- a/recipes/engine/engine.expected/experimental.json
+++ b/recipes/engine/engine.expected/experimental.json
@@ -2865,7 +2865,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3408,7 +3407,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3454,7 +3452,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3542,7 +3539,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3678,7 +3674,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3907,7 +3902,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3995,7 +3989,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4083,7 +4076,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5645,7 +5637,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5733,7 +5724,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5821,7 +5811,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5909,7 +5898,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6981,7 +6969,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7029,7 +7016,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8101,7 +8087,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8149,7 +8134,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8237,7 +8221,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8815,7 +8798,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8903,7 +8885,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9481,7 +9462,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9569,7 +9549,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10147,7 +10126,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10235,7 +10213,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10770,7 +10747,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12165,7 +12141,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12585,7 +12560,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12679,7 +12653,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12773,7 +12746,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12871,7 +12843,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12965,7 +12936,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13059,7 +13029,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13341,7 +13310,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13435,7 +13403,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13529,7 +13496,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13627,7 +13593,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13721,7 +13686,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13815,7 +13779,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14097,7 +14060,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14191,7 +14153,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14285,7 +14246,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14383,7 +14343,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14477,7 +14436,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14571,7 +14529,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/experimental_upload.json b/recipes/engine/engine.expected/experimental_upload.json
index 35d14dd..88005e0 100644
--- a/recipes/engine/engine.expected/experimental_upload.json
+++ b/recipes/engine/engine.expected/experimental_upload.json
@@ -2865,7 +2865,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3408,7 +3407,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3454,7 +3452,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3593,7 +3590,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3831,7 +3827,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4111,7 +4106,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4250,7 +4244,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4389,7 +4382,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6002,7 +5994,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6141,7 +6132,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6280,7 +6270,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6419,7 +6408,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7542,7 +7530,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7590,7 +7577,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8713,7 +8699,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8761,7 +8746,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8900,7 +8884,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9631,7 +9614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9770,7 +9752,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10501,7 +10482,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10640,7 +10620,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11371,7 +11350,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11510,7 +11488,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12351,7 +12328,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13905,7 +13881,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -14325,7 +14300,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14575,7 +14549,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14721,7 +14694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15027,7 +14999,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15277,7 +15248,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15423,7 +15393,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15966,7 +15935,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16216,7 +16184,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16362,7 +16329,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16512,7 +16478,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16762,7 +16727,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16908,7 +16872,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17295,7 +17258,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17545,7 +17507,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17691,7 +17652,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17841,7 +17801,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -18091,7 +18050,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -18237,7 +18195,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/fail_android_aot_sharded_builds.json b/recipes/engine/engine.expected/fail_android_aot_sharded_builds.json
index 434fba6..c761340 100644
--- a/recipes/engine/engine.expected/fail_android_aot_sharded_builds.json
+++ b/recipes/engine/engine.expected/fail_android_aot_sharded_builds.json
@@ -1864,7 +1864,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -1914,7 +1913,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/gcloud_pubsub_failure.json b/recipes/engine/engine.expected/gcloud_pubsub_failure.json
index ff98dbb..9d70fb0 100644
--- a/recipes/engine/engine.expected/gcloud_pubsub_failure.json
+++ b/recipes/engine/engine.expected/gcloud_pubsub_failure.json
@@ -2757,7 +2757,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3300,7 +3299,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3346,7 +3344,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3434,7 +3431,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3570,7 +3566,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3799,7 +3794,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3887,7 +3881,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3975,7 +3968,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5537,7 +5529,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5625,7 +5616,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5713,7 +5703,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5801,7 +5790,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6873,7 +6861,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6921,7 +6908,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7993,7 +7979,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8041,7 +8026,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8129,7 +8113,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8707,7 +8690,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8795,7 +8777,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9373,7 +9354,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9461,7 +9441,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10039,7 +10018,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10127,7 +10105,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10662,7 +10639,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12067,7 +12043,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12487,7 +12462,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12581,7 +12555,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12675,7 +12648,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12773,7 +12745,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12867,7 +12838,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12961,7 +12931,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13243,7 +13212,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13337,7 +13305,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13431,7 +13398,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13529,7 +13495,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13623,7 +13588,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13717,7 +13681,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13999,7 +13962,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14093,7 +14055,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14187,7 +14148,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14285,7 +14245,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14379,7 +14338,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14473,7 +14431,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux.json b/recipes/engine/engine.expected/linux.json
index 5d84d45..f2bb3f1 100644
--- a/recipes/engine/engine.expected/linux.json
+++ b/recipes/engine/engine.expected/linux.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3432,7 +3429,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3568,7 +3564,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3797,7 +3792,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3885,7 +3879,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3973,7 +3966,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5535,7 +5527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5623,7 +5614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5711,7 +5701,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5799,7 +5788,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6871,7 +6859,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6919,7 +6906,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7991,7 +7977,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8039,7 +8024,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8127,7 +8111,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8705,7 +8688,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8793,7 +8775,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9371,7 +9352,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9459,7 +9439,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10037,7 +10016,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10125,7 +10103,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10660,7 +10637,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12055,7 +12031,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12526,7 +12501,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12620,7 +12594,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12714,7 +12687,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12812,7 +12784,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12906,7 +12877,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13000,7 +12970,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13282,7 +13251,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13376,7 +13344,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13470,7 +13437,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13568,7 +13534,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13662,7 +13627,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13756,7 +13720,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14038,7 +14001,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14132,7 +14094,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14226,7 +14187,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14324,7 +14284,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14418,7 +14377,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14512,7 +14470,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_font_subset.json b/recipes/engine/engine.expected/linux_font_subset.json
index 5d84d45..f2bb3f1 100644
--- a/recipes/engine/engine.expected/linux_font_subset.json
+++ b/recipes/engine/engine.expected/linux_font_subset.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3432,7 +3429,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3568,7 +3564,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3797,7 +3792,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3885,7 +3879,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3973,7 +3966,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5535,7 +5527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5623,7 +5614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5711,7 +5701,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5799,7 +5788,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6871,7 +6859,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6919,7 +6906,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7991,7 +7977,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8039,7 +8024,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8127,7 +8111,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8705,7 +8688,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8793,7 +8775,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9371,7 +9352,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9459,7 +9439,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10037,7 +10016,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10125,7 +10103,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10660,7 +10637,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12055,7 +12031,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12526,7 +12501,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12620,7 +12594,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12714,7 +12687,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12812,7 +12784,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12906,7 +12877,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13000,7 +12970,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13282,7 +13251,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13376,7 +13344,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13470,7 +13437,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13568,7 +13534,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13662,7 +13627,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13756,7 +13720,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14038,7 +14001,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14132,7 +14094,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14226,7 +14187,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14324,7 +14284,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14418,7 +14377,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14512,7 +14470,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_maven.json b/recipes/engine/engine.expected/linux_maven.json
index 5d84d45..f2bb3f1 100644
--- a/recipes/engine/engine.expected/linux_maven.json
+++ b/recipes/engine/engine.expected/linux_maven.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3432,7 +3429,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3568,7 +3564,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3797,7 +3792,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3885,7 +3879,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3973,7 +3966,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5535,7 +5527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5623,7 +5614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5711,7 +5701,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5799,7 +5788,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6871,7 +6859,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6919,7 +6906,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7991,7 +7977,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8039,7 +8024,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8127,7 +8111,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8705,7 +8688,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8793,7 +8775,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9371,7 +9352,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9459,7 +9439,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10037,7 +10016,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10125,7 +10103,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10660,7 +10637,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12055,7 +12031,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12526,7 +12501,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12620,7 +12594,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12714,7 +12687,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12812,7 +12784,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12906,7 +12877,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13000,7 +12970,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13282,7 +13251,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13376,7 +13344,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13470,7 +13437,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13568,7 +13534,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13662,7 +13627,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13756,7 +13720,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14038,7 +14001,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14132,7 +14094,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14226,7 +14187,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14324,7 +14284,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14418,7 +14377,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14512,7 +14470,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_maven_font_subset.json b/recipes/engine/engine.expected/linux_maven_font_subset.json
index 5d84d45..f2bb3f1 100644
--- a/recipes/engine/engine.expected/linux_maven_font_subset.json
+++ b/recipes/engine/engine.expected/linux_maven_font_subset.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3432,7 +3429,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3568,7 +3564,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3797,7 +3792,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3885,7 +3879,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3973,7 +3966,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5535,7 +5527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5623,7 +5614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5711,7 +5701,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5799,7 +5788,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6871,7 +6859,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6919,7 +6906,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7991,7 +7977,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8039,7 +8024,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8127,7 +8111,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8705,7 +8688,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8793,7 +8775,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9371,7 +9352,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9459,7 +9439,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10037,7 +10016,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10125,7 +10103,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10660,7 +10637,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12055,7 +12031,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12526,7 +12501,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12620,7 +12594,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12714,7 +12687,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12812,7 +12784,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12906,7 +12877,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13000,7 +12970,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13282,7 +13251,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13376,7 +13344,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13470,7 +13437,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13568,7 +13534,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13662,7 +13627,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13756,7 +13720,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14038,7 +14001,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14132,7 +14094,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14226,7 +14187,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14324,7 +14284,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14418,7 +14377,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14512,7 +14470,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_maven_no_lto.json b/recipes/engine/engine.expected/linux_maven_no_lto.json
index 91c4d39..9b2d32e 100644
--- a/recipes/engine/engine.expected/linux_maven_no_lto.json
+++ b/recipes/engine/engine.expected/linux_maven_no_lto.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3435,7 +3432,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3571,7 +3567,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3800,7 +3795,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3888,7 +3882,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3976,7 +3969,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5540,7 +5532,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5628,7 +5619,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5716,7 +5706,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5804,7 +5793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6877,7 +6865,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6925,7 +6912,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7997,7 +7983,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8045,7 +8030,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8133,7 +8117,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8711,7 +8694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8799,7 +8781,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9377,7 +9358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9465,7 +9445,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10043,7 +10022,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10131,7 +10109,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10666,7 +10643,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12062,7 +12038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12533,7 +12508,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12627,7 +12601,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12721,7 +12694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12819,7 +12791,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12913,7 +12884,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13007,7 +12977,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13289,7 +13258,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13383,7 +13351,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13477,7 +13444,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13575,7 +13541,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13669,7 +13634,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13763,7 +13727,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14045,7 +14008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14139,7 +14101,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14233,7 +14194,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14331,7 +14291,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14425,7 +14384,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14519,7 +14477,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_maven_no_lto_font_subset.json b/recipes/engine/engine.expected/linux_maven_no_lto_font_subset.json
index 91c4d39..9b2d32e 100644
--- a/recipes/engine/engine.expected/linux_maven_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/linux_maven_no_lto_font_subset.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3435,7 +3432,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3571,7 +3567,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3800,7 +3795,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3888,7 +3882,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3976,7 +3969,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5540,7 +5532,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5628,7 +5619,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5716,7 +5706,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5804,7 +5793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6877,7 +6865,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6925,7 +6912,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7997,7 +7983,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8045,7 +8030,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8133,7 +8117,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8711,7 +8694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8799,7 +8781,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9377,7 +9358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9465,7 +9445,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10043,7 +10022,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10131,7 +10109,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10666,7 +10643,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12062,7 +12038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12533,7 +12508,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12627,7 +12601,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12721,7 +12694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12819,7 +12791,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12913,7 +12884,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13007,7 +12977,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13289,7 +13258,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13383,7 +13351,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13477,7 +13444,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13575,7 +13541,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13669,7 +13634,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13763,7 +13727,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14045,7 +14008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14139,7 +14101,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14233,7 +14194,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14331,7 +14291,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14425,7 +14384,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14519,7 +14477,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_maven_publish_cipd.json b/recipes/engine/engine.expected/linux_maven_publish_cipd.json
index 5d84d45..f2bb3f1 100644
--- a/recipes/engine/engine.expected/linux_maven_publish_cipd.json
+++ b/recipes/engine/engine.expected/linux_maven_publish_cipd.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3432,7 +3429,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3568,7 +3564,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3797,7 +3792,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3885,7 +3879,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3973,7 +3966,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5535,7 +5527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5623,7 +5614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5711,7 +5701,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5799,7 +5788,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6871,7 +6859,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6919,7 +6906,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7991,7 +7977,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8039,7 +8024,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8127,7 +8111,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8705,7 +8688,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8793,7 +8775,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9371,7 +9352,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9459,7 +9439,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10037,7 +10016,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10125,7 +10103,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10660,7 +10637,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12055,7 +12031,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12526,7 +12501,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12620,7 +12594,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12714,7 +12687,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12812,7 +12784,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12906,7 +12877,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13000,7 +12970,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13282,7 +13251,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13376,7 +13344,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13470,7 +13437,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13568,7 +13534,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13662,7 +13627,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13756,7 +13720,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14038,7 +14001,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14132,7 +14094,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14226,7 +14187,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14324,7 +14284,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14418,7 +14377,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14512,7 +14470,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_maven_publish_cipd_font_subset.json b/recipes/engine/engine.expected/linux_maven_publish_cipd_font_subset.json
index 5d84d45..f2bb3f1 100644
--- a/recipes/engine/engine.expected/linux_maven_publish_cipd_font_subset.json
+++ b/recipes/engine/engine.expected/linux_maven_publish_cipd_font_subset.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3432,7 +3429,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3568,7 +3564,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3797,7 +3792,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3885,7 +3879,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3973,7 +3966,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5535,7 +5527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5623,7 +5614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5711,7 +5701,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5799,7 +5788,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6871,7 +6859,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6919,7 +6906,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7991,7 +7977,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8039,7 +8024,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8127,7 +8111,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8705,7 +8688,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8793,7 +8775,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9371,7 +9352,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9459,7 +9439,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10037,7 +10016,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10125,7 +10103,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10660,7 +10637,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12055,7 +12031,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12526,7 +12501,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12620,7 +12594,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12714,7 +12687,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12812,7 +12784,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12906,7 +12877,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13000,7 +12970,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13282,7 +13251,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13376,7 +13344,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13470,7 +13437,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13568,7 +13534,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13662,7 +13627,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13756,7 +13720,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14038,7 +14001,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14132,7 +14094,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14226,7 +14187,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14324,7 +14284,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14418,7 +14377,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14512,7 +14470,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_maven_publish_cipd_no_lto.json b/recipes/engine/engine.expected/linux_maven_publish_cipd_no_lto.json
index 91c4d39..9b2d32e 100644
--- a/recipes/engine/engine.expected/linux_maven_publish_cipd_no_lto.json
+++ b/recipes/engine/engine.expected/linux_maven_publish_cipd_no_lto.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3435,7 +3432,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3571,7 +3567,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3800,7 +3795,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3888,7 +3882,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3976,7 +3969,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5540,7 +5532,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5628,7 +5619,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5716,7 +5706,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5804,7 +5793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6877,7 +6865,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6925,7 +6912,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7997,7 +7983,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8045,7 +8030,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8133,7 +8117,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8711,7 +8694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8799,7 +8781,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9377,7 +9358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9465,7 +9445,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10043,7 +10022,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10131,7 +10109,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10666,7 +10643,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12062,7 +12038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12533,7 +12508,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12627,7 +12601,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12721,7 +12694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12819,7 +12791,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12913,7 +12884,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13007,7 +12977,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13289,7 +13258,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13383,7 +13351,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13477,7 +13444,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13575,7 +13541,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13669,7 +13634,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13763,7 +13727,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14045,7 +14008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14139,7 +14101,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14233,7 +14194,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14331,7 +14291,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14425,7 +14384,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14519,7 +14477,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_maven_publish_cipd_no_lto_font_subset.json b/recipes/engine/engine.expected/linux_maven_publish_cipd_no_lto_font_subset.json
index 91c4d39..9b2d32e 100644
--- a/recipes/engine/engine.expected/linux_maven_publish_cipd_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/linux_maven_publish_cipd_no_lto_font_subset.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3435,7 +3432,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3571,7 +3567,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3800,7 +3795,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3888,7 +3882,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3976,7 +3969,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5540,7 +5532,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5628,7 +5619,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5716,7 +5706,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5804,7 +5793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6877,7 +6865,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6925,7 +6912,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7997,7 +7983,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8045,7 +8030,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8133,7 +8117,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8711,7 +8694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8799,7 +8781,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9377,7 +9358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9465,7 +9445,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10043,7 +10022,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10131,7 +10109,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10666,7 +10643,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12062,7 +12038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12533,7 +12508,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12627,7 +12601,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12721,7 +12694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12819,7 +12791,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12913,7 +12884,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13007,7 +12977,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13289,7 +13258,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13383,7 +13351,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13477,7 +13444,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13575,7 +13541,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13669,7 +13634,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13763,7 +13727,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14045,7 +14008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14139,7 +14101,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14233,7 +14194,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14331,7 +14291,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14425,7 +14384,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14519,7 +14477,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_no_lto.json b/recipes/engine/engine.expected/linux_no_lto.json
index 91c4d39..9b2d32e 100644
--- a/recipes/engine/engine.expected/linux_no_lto.json
+++ b/recipes/engine/engine.expected/linux_no_lto.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3435,7 +3432,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3571,7 +3567,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3800,7 +3795,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3888,7 +3882,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3976,7 +3969,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5540,7 +5532,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5628,7 +5619,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5716,7 +5706,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5804,7 +5793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6877,7 +6865,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6925,7 +6912,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7997,7 +7983,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8045,7 +8030,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8133,7 +8117,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8711,7 +8694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8799,7 +8781,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9377,7 +9358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9465,7 +9445,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10043,7 +10022,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10131,7 +10109,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10666,7 +10643,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12062,7 +12038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12533,7 +12508,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12627,7 +12601,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12721,7 +12694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12819,7 +12791,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12913,7 +12884,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13007,7 +12977,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13289,7 +13258,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13383,7 +13351,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13477,7 +13444,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13575,7 +13541,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13669,7 +13634,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13763,7 +13727,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14045,7 +14008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14139,7 +14101,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14233,7 +14194,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14331,7 +14291,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14425,7 +14384,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14519,7 +14477,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_no_lto_font_subset.json b/recipes/engine/engine.expected/linux_no_lto_font_subset.json
index 91c4d39..9b2d32e 100644
--- a/recipes/engine/engine.expected/linux_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/linux_no_lto_font_subset.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3435,7 +3432,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3571,7 +3567,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3800,7 +3795,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3888,7 +3882,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3976,7 +3969,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5540,7 +5532,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5628,7 +5619,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5716,7 +5706,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5804,7 +5793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6877,7 +6865,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6925,7 +6912,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7997,7 +7983,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8045,7 +8030,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8133,7 +8117,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8711,7 +8694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8799,7 +8781,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9377,7 +9358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9465,7 +9445,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10043,7 +10022,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10131,7 +10109,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10666,7 +10643,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12062,7 +12038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12533,7 +12508,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12627,7 +12601,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12721,7 +12694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12819,7 +12791,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12913,7 +12884,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13007,7 +12977,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13289,7 +13258,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13383,7 +13351,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13477,7 +13444,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13575,7 +13541,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13669,7 +13634,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13763,7 +13727,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14045,7 +14008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14139,7 +14101,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14233,7 +14194,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14331,7 +14291,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14425,7 +14384,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14519,7 +14477,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_publish_cipd.json b/recipes/engine/engine.expected/linux_publish_cipd.json
index 5d84d45..f2bb3f1 100644
--- a/recipes/engine/engine.expected/linux_publish_cipd.json
+++ b/recipes/engine/engine.expected/linux_publish_cipd.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3432,7 +3429,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3568,7 +3564,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3797,7 +3792,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3885,7 +3879,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3973,7 +3966,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5535,7 +5527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5623,7 +5614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5711,7 +5701,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5799,7 +5788,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6871,7 +6859,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6919,7 +6906,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7991,7 +7977,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8039,7 +8024,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8127,7 +8111,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8705,7 +8688,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8793,7 +8775,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9371,7 +9352,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9459,7 +9439,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10037,7 +10016,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10125,7 +10103,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10660,7 +10637,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12055,7 +12031,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12526,7 +12501,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12620,7 +12594,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12714,7 +12687,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12812,7 +12784,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12906,7 +12877,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13000,7 +12970,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13282,7 +13251,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13376,7 +13344,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13470,7 +13437,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13568,7 +13534,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13662,7 +13627,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13756,7 +13720,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14038,7 +14001,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14132,7 +14094,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14226,7 +14187,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14324,7 +14284,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14418,7 +14377,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14512,7 +14470,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_publish_cipd_font_subset.json b/recipes/engine/engine.expected/linux_publish_cipd_font_subset.json
index 5d84d45..f2bb3f1 100644
--- a/recipes/engine/engine.expected/linux_publish_cipd_font_subset.json
+++ b/recipes/engine/engine.expected/linux_publish_cipd_font_subset.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3432,7 +3429,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3568,7 +3564,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3797,7 +3792,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3885,7 +3879,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3973,7 +3966,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5535,7 +5527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5623,7 +5614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5711,7 +5701,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5799,7 +5788,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6871,7 +6859,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6919,7 +6906,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7991,7 +7977,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8039,7 +8024,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8127,7 +8111,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8705,7 +8688,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8793,7 +8775,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9371,7 +9352,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9459,7 +9439,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10037,7 +10016,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10125,7 +10103,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10660,7 +10637,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12055,7 +12031,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12526,7 +12501,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12620,7 +12594,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12714,7 +12687,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12812,7 +12784,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12906,7 +12877,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13000,7 +12970,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13282,7 +13251,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13376,7 +13344,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13470,7 +13437,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13568,7 +13534,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13662,7 +13627,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13756,7 +13720,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14038,7 +14001,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14132,7 +14094,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14226,7 +14187,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14324,7 +14284,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14418,7 +14377,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14512,7 +14470,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_publish_cipd_no_lto.json b/recipes/engine/engine.expected/linux_publish_cipd_no_lto.json
index 91c4d39..9b2d32e 100644
--- a/recipes/engine/engine.expected/linux_publish_cipd_no_lto.json
+++ b/recipes/engine/engine.expected/linux_publish_cipd_no_lto.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3435,7 +3432,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3571,7 +3567,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3800,7 +3795,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3888,7 +3882,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3976,7 +3969,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5540,7 +5532,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5628,7 +5619,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5716,7 +5706,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5804,7 +5793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6877,7 +6865,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6925,7 +6912,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7997,7 +7983,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8045,7 +8030,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8133,7 +8117,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8711,7 +8694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8799,7 +8781,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9377,7 +9358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9465,7 +9445,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10043,7 +10022,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10131,7 +10109,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10666,7 +10643,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12062,7 +12038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12533,7 +12508,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12627,7 +12601,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12721,7 +12694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12819,7 +12791,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12913,7 +12884,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13007,7 +12977,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13289,7 +13258,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13383,7 +13351,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13477,7 +13444,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13575,7 +13541,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13669,7 +13634,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13763,7 +13727,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14045,7 +14008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14139,7 +14101,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14233,7 +14194,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14331,7 +14291,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14425,7 +14384,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14519,7 +14477,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_publish_cipd_no_lto_font_subset.json b/recipes/engine/engine.expected/linux_publish_cipd_no_lto_font_subset.json
index 91c4d39..9b2d32e 100644
--- a/recipes/engine/engine.expected/linux_publish_cipd_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/linux_publish_cipd_no_lto_font_subset.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3435,7 +3432,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3571,7 +3567,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3800,7 +3795,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3888,7 +3882,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3976,7 +3969,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5540,7 +5532,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5628,7 +5619,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5716,7 +5706,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5804,7 +5793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6877,7 +6865,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6925,7 +6912,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7997,7 +7983,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8045,7 +8030,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8133,7 +8117,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8711,7 +8694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8799,7 +8781,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9377,7 +9358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9465,7 +9445,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10043,7 +10022,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10131,7 +10109,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10666,7 +10643,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12062,7 +12038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12533,7 +12508,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12627,7 +12601,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12721,7 +12694,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12819,7 +12791,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12913,7 +12884,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13007,7 +12977,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13289,7 +13258,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13383,7 +13351,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13477,7 +13444,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13575,7 +13541,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13669,7 +13634,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13763,7 +13727,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14045,7 +14008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14139,7 +14101,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14233,7 +14194,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14331,7 +14291,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14425,7 +14384,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14519,7 +14477,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload.json b/recipes/engine/engine.expected/linux_upload.json
index 3bb9982..4676c20 100644
--- a/recipes/engine/engine.expected/linux_upload.json
+++ b/recipes/engine/engine.expected/linux_upload.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3483,7 +3480,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3670,7 +3666,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3950,7 +3945,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4089,7 +4083,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4228,7 +4221,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5841,7 +5833,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5980,7 +5971,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6119,7 +6109,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6258,7 +6247,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7381,7 +7369,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7429,7 +7416,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8552,7 +8538,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8600,7 +8585,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8739,7 +8723,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9470,7 +9453,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9609,7 +9591,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10340,7 +10321,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10479,7 +10459,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11210,7 +11189,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11349,7 +11327,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12190,7 +12167,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13744,7 +13720,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -14215,7 +14190,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14465,7 +14439,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14611,7 +14584,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14917,7 +14889,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15167,7 +15138,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15313,7 +15283,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15856,7 +15825,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16106,7 +16074,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16252,7 +16219,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16402,7 +16368,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16652,7 +16617,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16798,7 +16762,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17185,7 +17148,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17435,7 +17397,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17581,7 +17542,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17731,7 +17691,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17981,7 +17940,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -18127,7 +18085,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload_font_subset.json b/recipes/engine/engine.expected/linux_upload_font_subset.json
index e2ad66e..0a9b1c6 100644
--- a/recipes/engine/engine.expected/linux_upload_font_subset.json
+++ b/recipes/engine/engine.expected/linux_upload_font_subset.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3483,7 +3480,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3721,7 +3717,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4001,7 +3996,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4140,7 +4134,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4279,7 +4272,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5892,7 +5884,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6031,7 +6022,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6170,7 +6160,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6309,7 +6298,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7432,7 +7420,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7480,7 +7467,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8603,7 +8589,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8651,7 +8636,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8790,7 +8774,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9521,7 +9504,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9660,7 +9642,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10391,7 +10372,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10530,7 +10510,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11261,7 +11240,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11400,7 +11378,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12241,7 +12218,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13795,7 +13771,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -14266,7 +14241,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14516,7 +14490,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14662,7 +14635,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14968,7 +14940,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15218,7 +15189,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15364,7 +15334,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15907,7 +15876,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16157,7 +16125,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16303,7 +16270,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16453,7 +16419,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16703,7 +16668,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16849,7 +16813,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17236,7 +17199,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17486,7 +17448,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17632,7 +17593,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17782,7 +17742,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -18032,7 +17991,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -18178,7 +18136,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload_maven.json b/recipes/engine/engine.expected/linux_upload_maven.json
index 4fc9019..c09d16c 100644
--- a/recipes/engine/engine.expected/linux_upload_maven.json
+++ b/recipes/engine/engine.expected/linux_upload_maven.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3483,7 +3480,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3670,7 +3666,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3950,7 +3945,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4089,7 +4083,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4228,7 +4221,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5841,7 +5833,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5980,7 +5971,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6119,7 +6109,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6258,7 +6247,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7381,7 +7369,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7429,7 +7416,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8552,7 +8538,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8600,7 +8585,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8739,7 +8723,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9368,7 +9351,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9507,7 +9489,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10136,7 +10117,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10275,7 +10255,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10904,7 +10883,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11043,7 +11021,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11629,7 +11606,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13183,7 +13159,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -13654,7 +13629,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13800,7 +13774,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13946,7 +13919,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14096,7 +14068,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14242,7 +14213,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14388,7 +14358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14775,7 +14744,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14921,7 +14889,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15067,7 +15034,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15217,7 +15183,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15363,7 +15328,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15509,7 +15473,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15896,7 +15859,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16042,7 +16004,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16188,7 +16149,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16338,7 +16298,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16484,7 +16443,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16630,7 +16588,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload_maven_font_subset.json b/recipes/engine/engine.expected/linux_upload_maven_font_subset.json
index 553676b..fc50b45 100644
--- a/recipes/engine/engine.expected/linux_upload_maven_font_subset.json
+++ b/recipes/engine/engine.expected/linux_upload_maven_font_subset.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3483,7 +3480,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3721,7 +3717,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4001,7 +3996,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4140,7 +4134,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4279,7 +4272,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5892,7 +5884,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6031,7 +6022,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6170,7 +6160,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6309,7 +6298,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7432,7 +7420,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7480,7 +7467,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8603,7 +8589,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8651,7 +8636,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8790,7 +8774,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9419,7 +9402,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9558,7 +9540,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10187,7 +10168,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10326,7 +10306,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10955,7 +10934,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11094,7 +11072,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11680,7 +11657,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13234,7 +13210,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -13705,7 +13680,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13851,7 +13825,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13997,7 +13970,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14147,7 +14119,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14293,7 +14264,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14439,7 +14409,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14826,7 +14795,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14972,7 +14940,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15118,7 +15085,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15268,7 +15234,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15414,7 +15379,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15560,7 +15524,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15947,7 +15910,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16093,7 +16055,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16239,7 +16200,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16389,7 +16349,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16535,7 +16494,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16681,7 +16639,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload_maven_no_lto.json b/recipes/engine/engine.expected/linux_upload_maven_no_lto.json
index 2bb8c46..235fa5b 100644
--- a/recipes/engine/engine.expected/linux_upload_maven_no_lto.json
+++ b/recipes/engine/engine.expected/linux_upload_maven_no_lto.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3486,7 +3483,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3673,7 +3669,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3953,7 +3948,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4092,7 +4086,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4231,7 +4224,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5846,7 +5838,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5985,7 +5976,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6124,7 +6114,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6263,7 +6252,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7387,7 +7375,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7435,7 +7422,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8558,7 +8544,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8606,7 +8591,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8745,7 +8729,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9374,7 +9357,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9513,7 +9495,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10142,7 +10123,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10281,7 +10261,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10910,7 +10889,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11049,7 +11027,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11635,7 +11612,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13190,7 +13166,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -13661,7 +13636,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13807,7 +13781,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13953,7 +13926,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14103,7 +14075,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14249,7 +14220,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14395,7 +14365,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14782,7 +14751,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14928,7 +14896,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15074,7 +15041,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15224,7 +15190,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15370,7 +15335,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15516,7 +15480,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15903,7 +15866,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16049,7 +16011,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16195,7 +16156,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16345,7 +16305,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16491,7 +16450,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16637,7 +16595,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload_maven_no_lto_font_subset.json b/recipes/engine/engine.expected/linux_upload_maven_no_lto_font_subset.json
index 4ec26fc..cbce165 100644
--- a/recipes/engine/engine.expected/linux_upload_maven_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/linux_upload_maven_no_lto_font_subset.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3486,7 +3483,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3724,7 +3720,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4004,7 +3999,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4143,7 +4137,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4282,7 +4275,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5897,7 +5889,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6036,7 +6027,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6175,7 +6165,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6314,7 +6303,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7438,7 +7426,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7486,7 +7473,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8609,7 +8595,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8657,7 +8642,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8796,7 +8780,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9425,7 +9408,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9564,7 +9546,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10193,7 +10174,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10332,7 +10312,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10961,7 +10940,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11100,7 +11078,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11686,7 +11663,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13241,7 +13217,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -13712,7 +13687,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13858,7 +13832,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14004,7 +13977,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14154,7 +14126,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14300,7 +14271,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14446,7 +14416,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14833,7 +14802,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14979,7 +14947,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15125,7 +15092,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15275,7 +15241,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15421,7 +15386,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15567,7 +15531,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15954,7 +15917,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16100,7 +16062,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16246,7 +16207,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16396,7 +16356,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16542,7 +16501,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16688,7 +16646,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload_maven_publish_cipd.json b/recipes/engine/engine.expected/linux_upload_maven_publish_cipd.json
index cb3d6da..ef20ea3 100644
--- a/recipes/engine/engine.expected/linux_upload_maven_publish_cipd.json
+++ b/recipes/engine/engine.expected/linux_upload_maven_publish_cipd.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3483,7 +3480,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3670,7 +3666,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3950,7 +3945,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4089,7 +4083,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4228,7 +4221,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5841,7 +5833,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5980,7 +5971,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6119,7 +6109,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6258,7 +6247,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7381,7 +7369,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7429,7 +7416,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8552,7 +8538,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8600,7 +8585,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8739,7 +8723,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9368,7 +9351,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9507,7 +9489,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10136,7 +10117,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10275,7 +10255,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10904,7 +10883,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11043,7 +11021,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11629,7 +11606,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13183,7 +13159,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -13654,7 +13629,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13800,7 +13774,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13946,7 +13919,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14096,7 +14068,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14242,7 +14213,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14388,7 +14358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14775,7 +14744,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14921,7 +14889,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15067,7 +15034,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15217,7 +15183,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15363,7 +15328,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15509,7 +15473,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15896,7 +15859,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16042,7 +16004,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16188,7 +16149,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16338,7 +16298,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16484,7 +16443,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16630,7 +16588,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload_maven_publish_cipd_font_subset.json b/recipes/engine/engine.expected/linux_upload_maven_publish_cipd_font_subset.json
index 4d0caa3..227893a 100644
--- a/recipes/engine/engine.expected/linux_upload_maven_publish_cipd_font_subset.json
+++ b/recipes/engine/engine.expected/linux_upload_maven_publish_cipd_font_subset.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3483,7 +3480,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3721,7 +3717,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4001,7 +3996,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4140,7 +4134,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4279,7 +4272,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5892,7 +5884,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6031,7 +6022,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6170,7 +6160,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6309,7 +6298,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7432,7 +7420,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7480,7 +7467,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8603,7 +8589,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8651,7 +8636,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8790,7 +8774,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9419,7 +9402,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9558,7 +9540,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10187,7 +10168,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10326,7 +10306,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10955,7 +10934,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11094,7 +11072,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11680,7 +11657,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13234,7 +13210,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -13705,7 +13680,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13851,7 +13825,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13997,7 +13970,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14147,7 +14119,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14293,7 +14264,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14439,7 +14409,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14826,7 +14795,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14972,7 +14940,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15118,7 +15085,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15268,7 +15234,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15414,7 +15379,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15560,7 +15524,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15947,7 +15910,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16093,7 +16055,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16239,7 +16200,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16389,7 +16349,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16535,7 +16494,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16681,7 +16639,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload_maven_publish_cipd_no_lto.json b/recipes/engine/engine.expected/linux_upload_maven_publish_cipd_no_lto.json
index 0dcb621..ce0cd4e 100644
--- a/recipes/engine/engine.expected/linux_upload_maven_publish_cipd_no_lto.json
+++ b/recipes/engine/engine.expected/linux_upload_maven_publish_cipd_no_lto.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3486,7 +3483,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3673,7 +3669,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3953,7 +3948,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4092,7 +4086,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4231,7 +4224,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5846,7 +5838,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5985,7 +5976,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6124,7 +6114,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6263,7 +6252,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7387,7 +7375,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7435,7 +7422,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8558,7 +8544,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8606,7 +8591,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8745,7 +8729,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9374,7 +9357,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9513,7 +9495,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10142,7 +10123,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10281,7 +10261,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10910,7 +10889,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11049,7 +11027,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11635,7 +11612,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13190,7 +13166,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -13661,7 +13636,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13807,7 +13781,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13953,7 +13926,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14103,7 +14075,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14249,7 +14220,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14395,7 +14365,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14782,7 +14751,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14928,7 +14896,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15074,7 +15041,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15224,7 +15190,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15370,7 +15335,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15516,7 +15480,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15903,7 +15866,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16049,7 +16011,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16195,7 +16156,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16345,7 +16305,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16491,7 +16450,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16637,7 +16595,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload_maven_publish_cipd_no_lto_font_subset.json b/recipes/engine/engine.expected/linux_upload_maven_publish_cipd_no_lto_font_subset.json
index a6166f1..a89438f 100644
--- a/recipes/engine/engine.expected/linux_upload_maven_publish_cipd_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/linux_upload_maven_publish_cipd_no_lto_font_subset.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3486,7 +3483,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3724,7 +3720,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4004,7 +3999,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4143,7 +4137,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4282,7 +4275,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5897,7 +5889,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6036,7 +6027,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6175,7 +6165,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6314,7 +6303,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7438,7 +7426,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7486,7 +7473,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8609,7 +8595,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8657,7 +8642,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8796,7 +8780,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9425,7 +9408,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9564,7 +9546,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10193,7 +10174,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10332,7 +10312,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10961,7 +10940,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11100,7 +11078,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11686,7 +11663,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13241,7 +13217,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -13712,7 +13687,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13858,7 +13832,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14004,7 +13977,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14154,7 +14126,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14300,7 +14271,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14446,7 +14416,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14833,7 +14802,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14979,7 +14947,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15125,7 +15092,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15275,7 +15241,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15421,7 +15386,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15567,7 +15531,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15954,7 +15917,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16100,7 +16062,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16246,7 +16207,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16396,7 +16356,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16542,7 +16501,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16688,7 +16646,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload_no_lto.json b/recipes/engine/engine.expected/linux_upload_no_lto.json
index b8a0c74..c72ca46 100644
--- a/recipes/engine/engine.expected/linux_upload_no_lto.json
+++ b/recipes/engine/engine.expected/linux_upload_no_lto.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3486,7 +3483,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3673,7 +3669,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3953,7 +3948,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4092,7 +4086,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4231,7 +4224,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5846,7 +5838,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5985,7 +5976,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6124,7 +6114,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6263,7 +6252,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7387,7 +7375,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7435,7 +7422,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8558,7 +8544,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8606,7 +8591,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8745,7 +8729,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9476,7 +9459,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9615,7 +9597,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10346,7 +10327,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10485,7 +10465,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11216,7 +11195,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11355,7 +11333,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12196,7 +12173,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13751,7 +13727,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -14222,7 +14197,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14472,7 +14446,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14618,7 +14591,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14924,7 +14896,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15174,7 +15145,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15320,7 +15290,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15863,7 +15832,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16113,7 +16081,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16259,7 +16226,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16409,7 +16375,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16659,7 +16624,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16805,7 +16769,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17192,7 +17155,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17442,7 +17404,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17588,7 +17549,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17738,7 +17698,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17988,7 +17947,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -18134,7 +18092,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload_no_lto_font_subset.json b/recipes/engine/engine.expected/linux_upload_no_lto_font_subset.json
index 3f20c9f..b88b7b8 100644
--- a/recipes/engine/engine.expected/linux_upload_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/linux_upload_no_lto_font_subset.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3486,7 +3483,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3724,7 +3720,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4004,7 +3999,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4143,7 +4137,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4282,7 +4275,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5897,7 +5889,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6036,7 +6027,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6175,7 +6165,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6314,7 +6303,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7438,7 +7426,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7486,7 +7473,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8609,7 +8595,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8657,7 +8642,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8796,7 +8780,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9527,7 +9510,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9666,7 +9648,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10397,7 +10378,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10536,7 +10516,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11267,7 +11246,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11406,7 +11384,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12247,7 +12224,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13802,7 +13778,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -14273,7 +14248,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14523,7 +14497,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14669,7 +14642,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14975,7 +14947,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15225,7 +15196,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15371,7 +15341,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15914,7 +15883,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16164,7 +16132,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16310,7 +16277,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16460,7 +16426,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16710,7 +16675,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16856,7 +16820,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17243,7 +17206,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17493,7 +17455,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17639,7 +17600,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17789,7 +17749,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -18039,7 +17998,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -18185,7 +18143,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload_publish_cipd.json b/recipes/engine/engine.expected/linux_upload_publish_cipd.json
index fd25407..9291090 100644
--- a/recipes/engine/engine.expected/linux_upload_publish_cipd.json
+++ b/recipes/engine/engine.expected/linux_upload_publish_cipd.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3483,7 +3480,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3670,7 +3666,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3950,7 +3945,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4089,7 +4083,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4228,7 +4221,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5841,7 +5833,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5980,7 +5971,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6119,7 +6109,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6258,7 +6247,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7381,7 +7369,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7429,7 +7416,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8552,7 +8538,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8600,7 +8585,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8739,7 +8723,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9470,7 +9453,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9609,7 +9591,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10340,7 +10321,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10479,7 +10459,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11210,7 +11189,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11349,7 +11327,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12190,7 +12167,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13744,7 +13720,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -14215,7 +14190,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14465,7 +14439,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14611,7 +14584,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14917,7 +14889,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15167,7 +15138,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15313,7 +15283,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15856,7 +15825,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16106,7 +16074,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16252,7 +16219,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16402,7 +16368,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16652,7 +16617,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16798,7 +16762,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17185,7 +17148,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17435,7 +17397,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17581,7 +17542,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17731,7 +17691,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17981,7 +17940,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -18127,7 +18085,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload_publish_cipd_font_subset.json b/recipes/engine/engine.expected/linux_upload_publish_cipd_font_subset.json
index 8c563e0..a9ecdcf 100644
--- a/recipes/engine/engine.expected/linux_upload_publish_cipd_font_subset.json
+++ b/recipes/engine/engine.expected/linux_upload_publish_cipd_font_subset.json
@@ -2755,7 +2755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3298,7 +3297,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3344,7 +3342,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3483,7 +3480,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3721,7 +3717,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4001,7 +3996,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4140,7 +4134,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4279,7 +4272,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5892,7 +5884,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6031,7 +6022,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6170,7 +6160,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6309,7 +6298,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7432,7 +7420,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7480,7 +7467,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8603,7 +8589,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8651,7 +8636,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8790,7 +8774,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9521,7 +9504,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9660,7 +9642,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10391,7 +10372,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10530,7 +10510,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11261,7 +11240,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11400,7 +11378,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12241,7 +12218,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13795,7 +13771,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -14266,7 +14241,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14516,7 +14490,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14662,7 +14635,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14968,7 +14940,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15218,7 +15189,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15364,7 +15334,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15907,7 +15876,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16157,7 +16125,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16303,7 +16270,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16453,7 +16419,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16703,7 +16668,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16849,7 +16813,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17236,7 +17199,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17486,7 +17448,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17632,7 +17593,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17782,7 +17742,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -18032,7 +17991,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -18178,7 +18136,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload_publish_cipd_no_lto.json b/recipes/engine/engine.expected/linux_upload_publish_cipd_no_lto.json
index 3c5c2b3..bae7f89 100644
--- a/recipes/engine/engine.expected/linux_upload_publish_cipd_no_lto.json
+++ b/recipes/engine/engine.expected/linux_upload_publish_cipd_no_lto.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3486,7 +3483,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3673,7 +3669,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3953,7 +3948,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4092,7 +4086,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4231,7 +4224,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5846,7 +5838,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5985,7 +5976,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6124,7 +6114,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6263,7 +6252,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7387,7 +7375,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7435,7 +7422,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8558,7 +8544,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8606,7 +8591,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8745,7 +8729,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9476,7 +9459,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9615,7 +9597,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10346,7 +10327,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10485,7 +10465,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11216,7 +11195,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11355,7 +11333,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12196,7 +12173,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13751,7 +13727,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -14222,7 +14197,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14472,7 +14446,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14618,7 +14591,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14924,7 +14896,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15174,7 +15145,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15320,7 +15290,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15863,7 +15832,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16113,7 +16081,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16259,7 +16226,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16409,7 +16375,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16659,7 +16624,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16805,7 +16769,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17192,7 +17155,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17442,7 +17404,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17588,7 +17549,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17738,7 +17698,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17988,7 +17947,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -18134,7 +18092,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/linux_upload_publish_cipd_no_lto_font_subset.json b/recipes/engine/engine.expected/linux_upload_publish_cipd_no_lto_font_subset.json
index f011fa3..49802a6 100644
--- a/recipes/engine/engine.expected/linux_upload_publish_cipd_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/linux_upload_publish_cipd_no_lto_font_subset.json
@@ -2758,7 +2758,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3301,7 +3300,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3347,7 +3345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3486,7 +3483,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3724,7 +3720,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4004,7 +3999,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4143,7 +4137,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4282,7 +4275,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5897,7 +5889,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6036,7 +6027,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6175,7 +6165,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6314,7 +6303,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7438,7 +7426,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -7486,7 +7473,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8609,7 +8595,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8657,7 +8642,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8796,7 +8780,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9527,7 +9510,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9666,7 +9648,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10397,7 +10378,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10536,7 +10516,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11267,7 +11246,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11406,7 +11384,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12247,7 +12224,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13802,7 +13778,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -14273,7 +14248,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14523,7 +14497,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14669,7 +14642,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14975,7 +14947,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15225,7 +15196,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15371,7 +15341,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -15914,7 +15883,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16164,7 +16132,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16310,7 +16277,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16460,7 +16426,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16710,7 +16675,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -16856,7 +16820,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17243,7 +17206,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17493,7 +17455,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17639,7 +17600,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -17789,7 +17749,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -18039,7 +17998,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -18185,7 +18143,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac.json b/recipes/engine/engine.expected/mac.json
index d31e8d2..378f3e3 100644
--- a/recipes/engine/engine.expected/mac.json
+++ b/recipes/engine/engine.expected/mac.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4312,7 +4309,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4490,7 +4486,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4532,7 +4527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4620,7 +4614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4800,7 +4793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4842,7 +4834,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4930,7 +4921,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5018,7 +5008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5060,7 +5049,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5148,7 +5136,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5236,7 +5223,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5310,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5412,7 +5397,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5500,7 +5484,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5588,7 +5571,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8626,7 +8608,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8714,7 +8695,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8802,7 +8782,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8890,7 +8869,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8978,7 +8956,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9066,7 +9043,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10403,7 +10379,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10638,7 +10613,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11384,7 +11358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11714,7 +11687,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11806,7 +11778,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11996,7 +11967,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12088,7 +12058,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac_font_subset.json b/recipes/engine/engine.expected/mac_font_subset.json
index d31e8d2..378f3e3 100644
--- a/recipes/engine/engine.expected/mac_font_subset.json
+++ b/recipes/engine/engine.expected/mac_font_subset.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4312,7 +4309,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4490,7 +4486,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4532,7 +4527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4620,7 +4614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4800,7 +4793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4842,7 +4834,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4930,7 +4921,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5018,7 +5008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5060,7 +5049,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5148,7 +5136,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5236,7 +5223,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5310,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5412,7 +5397,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5500,7 +5484,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5588,7 +5571,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8626,7 +8608,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8714,7 +8695,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8802,7 +8782,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8890,7 +8869,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8978,7 +8956,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9066,7 +9043,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10403,7 +10379,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10638,7 +10613,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11384,7 +11358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11714,7 +11687,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11806,7 +11778,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11996,7 +11967,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12088,7 +12058,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac_no_lto.json b/recipes/engine/engine.expected/mac_no_lto.json
index f3bef68..ad3fcf3 100644
--- a/recipes/engine/engine.expected/mac_no_lto.json
+++ b/recipes/engine/engine.expected/mac_no_lto.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4312,7 +4309,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4490,7 +4486,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4532,7 +4527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4620,7 +4614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4800,7 +4793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4842,7 +4834,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4930,7 +4921,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5018,7 +5008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5060,7 +5049,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5148,7 +5136,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5236,7 +5223,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5310,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5412,7 +5397,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5500,7 +5484,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5588,7 +5571,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8632,7 +8614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8720,7 +8701,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8808,7 +8788,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8896,7 +8875,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8984,7 +8962,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9072,7 +9049,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10410,7 +10386,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10645,7 +10620,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11392,7 +11366,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11723,7 +11696,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11815,7 +11787,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12005,7 +11976,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12097,7 +12067,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac_no_lto_font_subset.json b/recipes/engine/engine.expected/mac_no_lto_font_subset.json
index f3bef68..ad3fcf3 100644
--- a/recipes/engine/engine.expected/mac_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/mac_no_lto_font_subset.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4312,7 +4309,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4490,7 +4486,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4532,7 +4527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4620,7 +4614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4800,7 +4793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4842,7 +4834,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4930,7 +4921,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5018,7 +5008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5060,7 +5049,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5148,7 +5136,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5236,7 +5223,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5310,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5412,7 +5397,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5500,7 +5484,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5588,7 +5571,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8632,7 +8614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8720,7 +8701,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8808,7 +8788,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8896,7 +8875,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8984,7 +8962,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9072,7 +9049,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10410,7 +10386,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10645,7 +10620,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11392,7 +11366,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11723,7 +11696,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11815,7 +11787,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12005,7 +11976,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12097,7 +12067,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac_publish_cipd.json b/recipes/engine/engine.expected/mac_publish_cipd.json
index d31e8d2..378f3e3 100644
--- a/recipes/engine/engine.expected/mac_publish_cipd.json
+++ b/recipes/engine/engine.expected/mac_publish_cipd.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4312,7 +4309,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4490,7 +4486,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4532,7 +4527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4620,7 +4614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4800,7 +4793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4842,7 +4834,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4930,7 +4921,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5018,7 +5008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5060,7 +5049,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5148,7 +5136,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5236,7 +5223,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5310,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5412,7 +5397,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5500,7 +5484,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5588,7 +5571,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8626,7 +8608,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8714,7 +8695,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8802,7 +8782,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8890,7 +8869,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8978,7 +8956,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9066,7 +9043,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10403,7 +10379,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10638,7 +10613,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11384,7 +11358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11714,7 +11687,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11806,7 +11778,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11996,7 +11967,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12088,7 +12058,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac_publish_cipd_font_subset.json b/recipes/engine/engine.expected/mac_publish_cipd_font_subset.json
index d31e8d2..378f3e3 100644
--- a/recipes/engine/engine.expected/mac_publish_cipd_font_subset.json
+++ b/recipes/engine/engine.expected/mac_publish_cipd_font_subset.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4312,7 +4309,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4490,7 +4486,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4532,7 +4527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4620,7 +4614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4800,7 +4793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4842,7 +4834,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4930,7 +4921,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5018,7 +5008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5060,7 +5049,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5148,7 +5136,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5236,7 +5223,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5310,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5412,7 +5397,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5500,7 +5484,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5588,7 +5571,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8626,7 +8608,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8714,7 +8695,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8802,7 +8782,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8890,7 +8869,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8978,7 +8956,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9066,7 +9043,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10403,7 +10379,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10638,7 +10613,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11384,7 +11358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11714,7 +11687,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11806,7 +11778,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11996,7 +11967,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12088,7 +12058,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac_publish_cipd_no_lto.json b/recipes/engine/engine.expected/mac_publish_cipd_no_lto.json
index f3bef68..ad3fcf3 100644
--- a/recipes/engine/engine.expected/mac_publish_cipd_no_lto.json
+++ b/recipes/engine/engine.expected/mac_publish_cipd_no_lto.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4312,7 +4309,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4490,7 +4486,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4532,7 +4527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4620,7 +4614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4800,7 +4793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4842,7 +4834,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4930,7 +4921,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5018,7 +5008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5060,7 +5049,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5148,7 +5136,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5236,7 +5223,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5310,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5412,7 +5397,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5500,7 +5484,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5588,7 +5571,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8632,7 +8614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8720,7 +8701,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8808,7 +8788,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8896,7 +8875,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8984,7 +8962,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9072,7 +9049,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10410,7 +10386,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10645,7 +10620,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11392,7 +11366,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11723,7 +11696,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11815,7 +11787,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12005,7 +11976,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12097,7 +12067,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac_publish_cipd_no_lto_font_subset.json b/recipes/engine/engine.expected/mac_publish_cipd_no_lto_font_subset.json
index f3bef68..ad3fcf3 100644
--- a/recipes/engine/engine.expected/mac_publish_cipd_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/mac_publish_cipd_no_lto_font_subset.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4312,7 +4309,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4490,7 +4486,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4532,7 +4527,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4620,7 +4614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4800,7 +4793,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4842,7 +4834,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4930,7 +4921,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5018,7 +5008,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5060,7 +5049,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5148,7 +5136,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5236,7 +5223,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5310,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5412,7 +5397,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5500,7 +5484,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5588,7 +5571,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8632,7 +8614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8720,7 +8701,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8808,7 +8788,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8896,7 +8875,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8984,7 +8962,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9072,7 +9049,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10410,7 +10386,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10645,7 +10620,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11392,7 +11366,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11723,7 +11696,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11815,7 +11787,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12005,7 +11976,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12097,7 +12067,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac_upload.json b/recipes/engine/engine.expected/mac_upload.json
index 29dc7f0..3c43864 100644
--- a/recipes/engine/engine.expected/mac_upload.json
+++ b/recipes/engine/engine.expected/mac_upload.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4363,7 +4360,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4592,7 +4588,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4634,7 +4629,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4773,7 +4767,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5004,7 +4997,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5046,7 +5038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5185,7 +5176,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5314,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5366,7 +5355,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5505,7 +5493,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5644,7 +5631,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5783,7 +5769,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5922,7 +5907,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6061,7 +6045,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6200,7 +6183,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9289,7 +9271,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9428,7 +9409,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9567,7 +9547,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9706,7 +9685,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9845,7 +9823,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9984,7 +9961,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11372,7 +11348,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11660,7 +11635,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12459,7 +12433,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12842,7 +12815,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12987,7 +12959,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13230,7 +13201,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13375,7 +13345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac_upload_font_subset.json b/recipes/engine/engine.expected/mac_upload_font_subset.json
index 4e3cda5..fd6d654 100644
--- a/recipes/engine/engine.expected/mac_upload_font_subset.json
+++ b/recipes/engine/engine.expected/mac_upload_font_subset.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4363,7 +4360,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4592,7 +4588,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4634,7 +4629,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4773,7 +4767,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5004,7 +4997,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5046,7 +5038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5185,7 +5176,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5314,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5366,7 +5355,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5505,7 +5493,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5644,7 +5631,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5783,7 +5769,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5973,7 +5958,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6112,7 +6096,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6251,7 +6234,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9340,7 +9322,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9479,7 +9460,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9618,7 +9598,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9757,7 +9736,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9896,7 +9874,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10035,7 +10012,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11423,7 +11399,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11711,7 +11686,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12510,7 +12484,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12893,7 +12866,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13038,7 +13010,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13281,7 +13252,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13426,7 +13396,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac_upload_no_lto.json b/recipes/engine/engine.expected/mac_upload_no_lto.json
index 4115977..496ca8e 100644
--- a/recipes/engine/engine.expected/mac_upload_no_lto.json
+++ b/recipes/engine/engine.expected/mac_upload_no_lto.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4363,7 +4360,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4592,7 +4588,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4634,7 +4629,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4773,7 +4767,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5004,7 +4997,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5046,7 +5038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5185,7 +5176,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5314,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5366,7 +5355,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5505,7 +5493,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5644,7 +5631,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5783,7 +5769,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5922,7 +5907,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6061,7 +6045,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6200,7 +6183,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9295,7 +9277,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9434,7 +9415,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9573,7 +9553,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9712,7 +9691,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9851,7 +9829,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9990,7 +9967,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11379,7 +11355,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11667,7 +11642,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12467,7 +12441,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12851,7 +12824,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12996,7 +12968,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13239,7 +13210,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13384,7 +13354,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac_upload_no_lto_font_subset.json b/recipes/engine/engine.expected/mac_upload_no_lto_font_subset.json
index 8d4a89e..b90a315 100644
--- a/recipes/engine/engine.expected/mac_upload_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/mac_upload_no_lto_font_subset.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4363,7 +4360,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4592,7 +4588,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4634,7 +4629,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4773,7 +4767,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5004,7 +4997,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5046,7 +5038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5185,7 +5176,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5314,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5366,7 +5355,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5505,7 +5493,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5644,7 +5631,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5783,7 +5769,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5973,7 +5958,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6112,7 +6096,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6251,7 +6234,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9346,7 +9328,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9485,7 +9466,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9624,7 +9604,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9763,7 +9742,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9902,7 +9880,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10041,7 +10018,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11430,7 +11406,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11718,7 +11693,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12518,7 +12492,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12902,7 +12875,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13047,7 +13019,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13290,7 +13261,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13435,7 +13405,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac_upload_publish_cipd.json b/recipes/engine/engine.expected/mac_upload_publish_cipd.json
index 29dc7f0..3c43864 100644
--- a/recipes/engine/engine.expected/mac_upload_publish_cipd.json
+++ b/recipes/engine/engine.expected/mac_upload_publish_cipd.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4363,7 +4360,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4592,7 +4588,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4634,7 +4629,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4773,7 +4767,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5004,7 +4997,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5046,7 +5038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5185,7 +5176,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5314,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5366,7 +5355,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5505,7 +5493,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5644,7 +5631,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5783,7 +5769,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5922,7 +5907,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6061,7 +6045,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6200,7 +6183,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9289,7 +9271,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9428,7 +9409,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9567,7 +9547,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9706,7 +9685,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9845,7 +9823,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9984,7 +9961,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11372,7 +11348,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11660,7 +11635,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12459,7 +12433,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12842,7 +12815,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12987,7 +12959,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13230,7 +13201,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13375,7 +13345,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac_upload_publish_cipd_font_subset.json b/recipes/engine/engine.expected/mac_upload_publish_cipd_font_subset.json
index 4e3cda5..fd6d654 100644
--- a/recipes/engine/engine.expected/mac_upload_publish_cipd_font_subset.json
+++ b/recipes/engine/engine.expected/mac_upload_publish_cipd_font_subset.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4363,7 +4360,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4592,7 +4588,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4634,7 +4629,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4773,7 +4767,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5004,7 +4997,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5046,7 +5038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5185,7 +5176,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5314,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5366,7 +5355,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5505,7 +5493,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5644,7 +5631,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5783,7 +5769,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5973,7 +5958,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6112,7 +6096,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6251,7 +6234,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9340,7 +9322,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9479,7 +9460,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9618,7 +9598,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9757,7 +9736,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9896,7 +9874,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10035,7 +10012,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11423,7 +11399,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11711,7 +11686,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12510,7 +12484,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12893,7 +12866,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13038,7 +13010,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13281,7 +13252,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13426,7 +13396,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac_upload_publish_cipd_no_lto.json b/recipes/engine/engine.expected/mac_upload_publish_cipd_no_lto.json
index 4115977..496ca8e 100644
--- a/recipes/engine/engine.expected/mac_upload_publish_cipd_no_lto.json
+++ b/recipes/engine/engine.expected/mac_upload_publish_cipd_no_lto.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4363,7 +4360,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4592,7 +4588,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4634,7 +4629,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4773,7 +4767,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5004,7 +4997,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5046,7 +5038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5185,7 +5176,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5314,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5366,7 +5355,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5505,7 +5493,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5644,7 +5631,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5783,7 +5769,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5922,7 +5907,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6061,7 +6045,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6200,7 +6183,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9295,7 +9277,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9434,7 +9415,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9573,7 +9553,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9712,7 +9691,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9851,7 +9829,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9990,7 +9967,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11379,7 +11355,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11667,7 +11642,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12467,7 +12441,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12851,7 +12824,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12996,7 +12968,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13239,7 +13210,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13384,7 +13354,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/mac_upload_publish_cipd_no_lto_font_subset.json b/recipes/engine/engine.expected/mac_upload_publish_cipd_no_lto_font_subset.json
index 8d4a89e..b90a315 100644
--- a/recipes/engine/engine.expected/mac_upload_publish_cipd_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/mac_upload_publish_cipd_no_lto_font_subset.json
@@ -2262,7 +2262,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -4182,7 +4181,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4224,7 +4222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4363,7 +4360,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4592,7 +4588,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4634,7 +4629,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -4773,7 +4767,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5004,7 +4997,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5046,7 +5038,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5185,7 +5176,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5324,7 +5314,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5366,7 +5355,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5505,7 +5493,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5644,7 +5631,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5783,7 +5769,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5973,7 +5958,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6112,7 +6096,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6251,7 +6234,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9346,7 +9328,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9485,7 +9466,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9624,7 +9604,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9763,7 +9742,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9902,7 +9880,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10041,7 +10018,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11430,7 +11406,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -11718,7 +11693,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12518,7 +12492,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12902,7 +12875,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13047,7 +13019,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13290,7 +13261,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13435,7 +13405,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/pull_request.json b/recipes/engine/engine.expected/pull_request.json
index 4b4d24b..07e5e59 100644
--- a/recipes/engine/engine.expected/pull_request.json
+++ b/recipes/engine/engine.expected/pull_request.json
@@ -2757,7 +2757,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_profile",
@@ -3300,7 +3299,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_release",
@@ -3346,7 +3344,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3434,7 +3431,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3570,7 +3566,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3799,7 +3794,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3887,7 +3881,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -3975,7 +3968,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5537,7 +5529,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5625,7 +5616,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5713,7 +5703,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -5801,7 +5790,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -6873,7 +6861,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_jit_release_x86",
@@ -6921,7 +6908,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -7993,7 +7979,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug",
@@ -8041,7 +8026,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8129,7 +8113,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8707,7 +8690,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -8795,7 +8777,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9373,7 +9354,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -9461,7 +9441,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10039,7 +10018,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10127,7 +10105,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -10662,7 +10639,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12067,7 +12043,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "./flutter/ci/firebase_testlab.py",
       "--variant",
       "android_profile_arm64",
@@ -12487,7 +12462,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12581,7 +12555,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12675,7 +12648,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12773,7 +12745,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12867,7 +12838,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -12961,7 +12931,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13243,7 +13212,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13337,7 +13305,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13431,7 +13398,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13529,7 +13495,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13623,7 +13588,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13717,7 +13681,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -13999,7 +13962,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14093,7 +14055,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14187,7 +14148,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14285,7 +14245,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14379,7 +14338,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -14473,7 +14431,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine.expected/win.json b/recipes/engine/engine.expected/win.json
index f576826..81b537c 100644
--- a/recipes/engine/engine.expected/win.json
+++ b/recipes/engine/engine.expected/win.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2513,7 +2512,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2603,7 +2601,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2693,7 +2690,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2783,7 +2779,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2873,7 +2868,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2963,7 +2957,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3053,7 +3046,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3143,7 +3135,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3233,7 +3224,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6351,7 +6341,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6441,7 +6430,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6531,7 +6519,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6621,7 +6608,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6711,7 +6697,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6801,7 +6786,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine.expected/win_font_subset.json b/recipes/engine/engine.expected/win_font_subset.json
index f8944e7..c77c81a 100644
--- a/recipes/engine/engine.expected/win_font_subset.json
+++ b/recipes/engine/engine.expected/win_font_subset.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2972,7 +2971,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3062,7 +3060,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3152,7 +3149,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3242,7 +3238,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3332,7 +3327,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3422,7 +3416,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3512,7 +3505,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3602,7 +3594,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3692,7 +3683,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6810,7 +6800,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6900,7 +6889,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6990,7 +6978,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7080,7 +7067,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7170,7 +7156,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7260,7 +7245,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine.expected/win_no_lto.json b/recipes/engine/engine.expected/win_no_lto.json
index 7175832..1a3d9b5 100644
--- a/recipes/engine/engine.expected/win_no_lto.json
+++ b/recipes/engine/engine.expected/win_no_lto.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2513,7 +2512,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2603,7 +2601,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2693,7 +2690,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2783,7 +2779,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2873,7 +2868,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2963,7 +2957,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3053,7 +3046,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3143,7 +3135,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3233,7 +3224,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6357,7 +6347,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6447,7 +6436,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6537,7 +6525,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6627,7 +6614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6717,7 +6703,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6807,7 +6792,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine.expected/win_no_lto_font_subset.json b/recipes/engine/engine.expected/win_no_lto_font_subset.json
index 6089a3c..46c2e61 100644
--- a/recipes/engine/engine.expected/win_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/win_no_lto_font_subset.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2972,7 +2971,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3062,7 +3060,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3152,7 +3149,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3242,7 +3238,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3332,7 +3327,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3422,7 +3416,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3512,7 +3505,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3602,7 +3594,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3692,7 +3683,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6816,7 +6806,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6906,7 +6895,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6996,7 +6984,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7086,7 +7073,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7176,7 +7162,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7266,7 +7251,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine.expected/win_publish_cipd.json b/recipes/engine/engine.expected/win_publish_cipd.json
index f576826..81b537c 100644
--- a/recipes/engine/engine.expected/win_publish_cipd.json
+++ b/recipes/engine/engine.expected/win_publish_cipd.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2513,7 +2512,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2603,7 +2601,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2693,7 +2690,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2783,7 +2779,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2873,7 +2868,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2963,7 +2957,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3053,7 +3046,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3143,7 +3135,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3233,7 +3224,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6351,7 +6341,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6441,7 +6430,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6531,7 +6519,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6621,7 +6608,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6711,7 +6697,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6801,7 +6786,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine.expected/win_publish_cipd_font_subset.json b/recipes/engine/engine.expected/win_publish_cipd_font_subset.json
index f8944e7..c77c81a 100644
--- a/recipes/engine/engine.expected/win_publish_cipd_font_subset.json
+++ b/recipes/engine/engine.expected/win_publish_cipd_font_subset.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2972,7 +2971,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3062,7 +3060,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3152,7 +3149,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3242,7 +3238,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3332,7 +3327,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3422,7 +3416,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3512,7 +3505,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3602,7 +3594,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3692,7 +3683,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6810,7 +6800,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6900,7 +6889,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6990,7 +6978,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7080,7 +7067,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7170,7 +7156,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7260,7 +7245,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine.expected/win_publish_cipd_no_lto.json b/recipes/engine/engine.expected/win_publish_cipd_no_lto.json
index 7175832..1a3d9b5 100644
--- a/recipes/engine/engine.expected/win_publish_cipd_no_lto.json
+++ b/recipes/engine/engine.expected/win_publish_cipd_no_lto.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2513,7 +2512,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2603,7 +2601,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2693,7 +2690,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2783,7 +2779,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2873,7 +2868,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2963,7 +2957,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3053,7 +3046,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3143,7 +3135,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3233,7 +3224,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6357,7 +6347,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6447,7 +6436,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6537,7 +6525,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6627,7 +6614,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6717,7 +6703,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6807,7 +6792,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine.expected/win_publish_cipd_no_lto_font_subset.json b/recipes/engine/engine.expected/win_publish_cipd_no_lto_font_subset.json
index 6089a3c..46c2e61 100644
--- a/recipes/engine/engine.expected/win_publish_cipd_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/win_publish_cipd_no_lto_font_subset.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2972,7 +2971,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3062,7 +3060,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3152,7 +3149,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3242,7 +3238,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3332,7 +3327,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3422,7 +3416,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3512,7 +3505,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3602,7 +3594,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3692,7 +3683,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6816,7 +6806,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6906,7 +6895,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6996,7 +6984,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7086,7 +7073,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7176,7 +7162,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7266,7 +7251,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine.expected/win_upload.json b/recipes/engine/engine.expected/win_upload.json
index 5e75bf8..c4c168d 100644
--- a/recipes/engine/engine.expected/win_upload.json
+++ b/recipes/engine/engine.expected/win_upload.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2513,7 +2512,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2655,7 +2653,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2797,7 +2794,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2939,7 +2935,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3081,7 +3076,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3223,7 +3217,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3365,7 +3358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3507,7 +3499,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3649,7 +3640,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6819,7 +6809,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6961,7 +6950,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7103,7 +7091,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7245,7 +7232,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7387,7 +7373,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7529,7 +7514,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine.expected/win_upload_font_subset.json b/recipes/engine/engine.expected/win_upload_font_subset.json
index 19afe53..2b2c75b 100644
--- a/recipes/engine/engine.expected/win_upload_font_subset.json
+++ b/recipes/engine/engine.expected/win_upload_font_subset.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2972,7 +2971,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3114,7 +3112,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3256,7 +3253,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3398,7 +3394,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3540,7 +3535,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3682,7 +3676,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3824,7 +3817,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -4018,7 +4010,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -4160,7 +4151,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7330,7 +7320,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7472,7 +7461,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7614,7 +7602,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7756,7 +7743,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7898,7 +7884,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -8040,7 +8025,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine.expected/win_upload_no_lto.json b/recipes/engine/engine.expected/win_upload_no_lto.json
index c8489ce..d80e384 100644
--- a/recipes/engine/engine.expected/win_upload_no_lto.json
+++ b/recipes/engine/engine.expected/win_upload_no_lto.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2513,7 +2512,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2655,7 +2653,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2797,7 +2794,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2939,7 +2935,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3081,7 +3076,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3223,7 +3217,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3365,7 +3358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3507,7 +3499,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3649,7 +3640,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6825,7 +6815,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6967,7 +6956,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7109,7 +7097,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7251,7 +7238,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7393,7 +7379,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7535,7 +7520,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine.expected/win_upload_no_lto_font_subset.json b/recipes/engine/engine.expected/win_upload_no_lto_font_subset.json
index 14cd6c8..3afcde9 100644
--- a/recipes/engine/engine.expected/win_upload_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/win_upload_no_lto_font_subset.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2972,7 +2971,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3114,7 +3112,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3256,7 +3253,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3398,7 +3394,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3540,7 +3535,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3682,7 +3676,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3824,7 +3817,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -4018,7 +4010,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -4160,7 +4151,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7336,7 +7326,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7478,7 +7467,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7620,7 +7608,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7762,7 +7749,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7904,7 +7890,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -8046,7 +8031,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine.expected/win_upload_publish_cipd.json b/recipes/engine/engine.expected/win_upload_publish_cipd.json
index 5e75bf8..c4c168d 100644
--- a/recipes/engine/engine.expected/win_upload_publish_cipd.json
+++ b/recipes/engine/engine.expected/win_upload_publish_cipd.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2513,7 +2512,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2655,7 +2653,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2797,7 +2794,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2939,7 +2935,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3081,7 +3076,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3223,7 +3217,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3365,7 +3358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3507,7 +3499,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3649,7 +3640,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6819,7 +6809,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6961,7 +6950,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7103,7 +7091,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7245,7 +7232,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7387,7 +7373,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7529,7 +7514,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine.expected/win_upload_publish_cipd_font_subset.json b/recipes/engine/engine.expected/win_upload_publish_cipd_font_subset.json
index 19afe53..2b2c75b 100644
--- a/recipes/engine/engine.expected/win_upload_publish_cipd_font_subset.json
+++ b/recipes/engine/engine.expected/win_upload_publish_cipd_font_subset.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2972,7 +2971,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3114,7 +3112,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3256,7 +3253,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3398,7 +3394,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3540,7 +3535,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3682,7 +3676,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3824,7 +3817,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -4018,7 +4010,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -4160,7 +4151,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7330,7 +7320,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7472,7 +7461,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7614,7 +7602,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7756,7 +7743,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7898,7 +7884,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -8040,7 +8025,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine.expected/win_upload_publish_cipd_no_lto.json b/recipes/engine/engine.expected/win_upload_publish_cipd_no_lto.json
index c8489ce..d80e384 100644
--- a/recipes/engine/engine.expected/win_upload_publish_cipd_no_lto.json
+++ b/recipes/engine/engine.expected/win_upload_publish_cipd_no_lto.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2513,7 +2512,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2655,7 +2653,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2797,7 +2794,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -2939,7 +2935,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3081,7 +3076,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3223,7 +3217,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3365,7 +3358,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3507,7 +3499,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3649,7 +3640,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6825,7 +6815,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -6967,7 +6956,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7109,7 +7097,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7251,7 +7238,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7393,7 +7379,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7535,7 +7520,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine.expected/win_upload_publish_cipd_no_lto_font_subset.json b/recipes/engine/engine.expected/win_upload_publish_cipd_no_lto_font_subset.json
index 14cd6c8..3afcde9 100644
--- a/recipes/engine/engine.expected/win_upload_publish_cipd_no_lto_font_subset.json
+++ b/recipes/engine/engine.expected/win_upload_publish_cipd_no_lto_font_subset.json
@@ -1404,7 +1404,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug",
@@ -2972,7 +2971,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3114,7 +3112,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3256,7 +3253,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3398,7 +3394,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3540,7 +3535,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3682,7 +3676,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -3824,7 +3817,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -4018,7 +4010,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -4160,7 +4151,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7336,7 +7326,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7478,7 +7467,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7620,7 +7608,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7762,7 +7749,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -7904,7 +7890,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
@@ -8046,7 +8031,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]\\resources\\zip.py"
     ],
     "cwd": "[CACHE]\\builder",
diff --git a/recipes/engine/engine_arm.expected/clobber.json b/recipes/engine/engine_arm.expected/clobber.json
index b857217..03ce7f3 100644
--- a/recipes/engine/engine_arm.expected/clobber.json
+++ b/recipes/engine/engine_arm.expected/clobber.json
@@ -2060,7 +2060,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2134,7 +2133,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2208,7 +2206,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2282,7 +2279,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2356,7 +2352,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2430,7 +2425,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2504,7 +2498,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine_arm.expected/experimental.json b/recipes/engine/engine_arm.expected/experimental.json
index 073f793..db26f4c 100644
--- a/recipes/engine/engine_arm.expected/experimental.json
+++ b/recipes/engine/engine_arm.expected/experimental.json
@@ -2058,7 +2058,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2132,7 +2131,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2206,7 +2204,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2280,7 +2277,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2354,7 +2350,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2428,7 +2423,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2502,7 +2496,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine_arm.expected/experimental_upload.json b/recipes/engine/engine_arm.expected/experimental_upload.json
index 3d1e547..7c74e10 100644
--- a/recipes/engine/engine_arm.expected/experimental_upload.json
+++ b/recipes/engine/engine_arm.expected/experimental_upload.json
@@ -2058,7 +2058,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2176,7 +2175,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2294,7 +2292,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2412,7 +2409,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2530,7 +2526,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2648,7 +2643,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2766,7 +2760,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine_arm.expected/gcloud_pubsub_failure.json b/recipes/engine/engine_arm.expected/gcloud_pubsub_failure.json
index 373c2de..ec4c0ea 100644
--- a/recipes/engine/engine_arm.expected/gcloud_pubsub_failure.json
+++ b/recipes/engine/engine_arm.expected/gcloud_pubsub_failure.json
@@ -2060,7 +2060,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2134,7 +2133,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2208,7 +2206,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2282,7 +2279,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2356,7 +2352,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2430,7 +2425,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2504,7 +2498,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine_arm.expected/linux.json b/recipes/engine/engine_arm.expected/linux.json
index 7c3baa6..02b4bd9 100644
--- a/recipes/engine/engine_arm.expected/linux.json
+++ b/recipes/engine/engine_arm.expected/linux.json
@@ -2058,7 +2058,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2132,7 +2131,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2206,7 +2204,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2280,7 +2277,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2354,7 +2350,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2428,7 +2423,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2502,7 +2496,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine_arm.expected/linux_upload.json b/recipes/engine/engine_arm.expected/linux_upload.json
index d04f920..3568f1e 100644
--- a/recipes/engine/engine_arm.expected/linux_upload.json
+++ b/recipes/engine/engine_arm.expected/linux_upload.json
@@ -2058,7 +2058,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2176,7 +2175,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2294,7 +2292,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2412,7 +2409,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2530,7 +2526,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2648,7 +2643,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2766,7 +2760,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine_arm.expected/pull_request.json b/recipes/engine/engine_arm.expected/pull_request.json
index b857217..03ce7f3 100644
--- a/recipes/engine/engine_arm.expected/pull_request.json
+++ b/recipes/engine/engine_arm.expected/pull_request.json
@@ -2060,7 +2060,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2134,7 +2133,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2208,7 +2206,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2282,7 +2279,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2356,7 +2352,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2430,7 +2425,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
@@ -2504,7 +2498,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder",
diff --git a/recipes/engine/engine_unopt.expected/linux.json b/recipes/engine/engine_unopt.expected/linux.json
index 3246151..fb88308 100644
--- a/recipes/engine/engine_unopt.expected/linux.json
+++ b/recipes/engine/engine_unopt.expected/linux.json
@@ -1536,7 +1536,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_debug_unopt",
@@ -2696,7 +2695,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug_unopt",
diff --git a/recipes/engine/engine_unopt.expected/linux_lto.json b/recipes/engine/engine_unopt.expected/linux_lto.json
index 349dffc..78ecbdb 100644
--- a/recipes/engine/engine_unopt.expected/linux_lto.json
+++ b/recipes/engine/engine_unopt.expected/linux_lto.json
@@ -1535,7 +1535,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_debug_unopt",
@@ -2693,7 +2692,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "android_debug_unopt",
diff --git a/recipes/engine/engine_unopt.expected/mac.json b/recipes/engine/engine_unopt.expected/mac.json
index 35de15a..b507979 100644
--- a/recipes/engine/engine_unopt.expected/mac.json
+++ b/recipes/engine/engine_unopt.expected/mac.json
@@ -1755,7 +1755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_debug_unopt",
@@ -2867,7 +2866,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "ios_debug_sim",
diff --git a/recipes/engine/engine_unopt.expected/mac_lto.json b/recipes/engine/engine_unopt.expected/mac_lto.json
index 35de15a..b507979 100644
--- a/recipes/engine/engine_unopt.expected/mac_lto.json
+++ b/recipes/engine/engine_unopt.expected/mac_lto.json
@@ -1755,7 +1755,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "host_debug_unopt",
@@ -2867,7 +2866,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]/.vpython",
-      "-u",
       "[CACHE]/builder/src/flutter/testing/run_tests.py",
       "--variant",
       "ios_debug_sim",
diff --git a/recipes/engine/engine_unopt.expected/win.json b/recipes/engine/engine_unopt.expected/win.json
index 2b9089e..0ed1536 100644
--- a/recipes/engine/engine_unopt.expected/win.json
+++ b/recipes/engine/engine_unopt.expected/win.json
@@ -1582,7 +1582,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug_unopt",
diff --git a/recipes/engine/engine_unopt.expected/win_lto.json b/recipes/engine/engine_unopt.expected/win_lto.json
index 2d08639..ef4757e 100644
--- a/recipes/engine/engine_unopt.expected/win_lto.json
+++ b/recipes/engine/engine_unopt.expected/win_lto.json
@@ -1581,7 +1581,6 @@
       "vpython",
       "-vpython-spec",
       "RECIPE_REPO[depot_tools]\\.vpython",
-      "-u",
       "[CACHE]\\builder\\src\\flutter\\testing\\run_tests.py",
       "--variant",
       "host_debug_unopt",
diff --git a/recipes/engine/femu_test.expected/dangerous_test_commands.json b/recipes/engine/femu_test.expected/dangerous_test_commands.json
index 14f267b..adfb887 100644
--- a/recipes/engine/femu_test.expected/dangerous_test_commands.json
+++ b/recipes/engine/femu_test.expected/dangerous_test_commands.json
@@ -2665,7 +2665,6 @@
   {
     "cmd": [
       "vpython",
-      "-u",
       "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
       "--yaml_file",
       "[CACHE]/builder/src/flutter/testing/fuchsia/test_suites.yaml",
diff --git a/recipes/engine/femu_test.expected/femu_vdl_with_package_list.json b/recipes/engine/femu_test.expected/femu_vdl_with_package_list.json
index f4e9b03..ca85ef0 100644
--- a/recipes/engine/femu_test.expected/femu_vdl_with_package_list.json
+++ b/recipes/engine/femu_test.expected/femu_vdl_with_package_list.json
@@ -2665,7 +2665,6 @@
   {
     "cmd": [
       "vpython",
-      "-u",
       "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
       "--yaml_file",
       "[CACHE]/builder/src/flutter/testing/fuchsia/test_suites.yaml",
diff --git a/recipes/engine/femu_test.expected/multiple_non_root_fars.json b/recipes/engine/femu_test.expected/multiple_non_root_fars.json
index b716af0..78abdfd 100644
--- a/recipes/engine/femu_test.expected/multiple_non_root_fars.json
+++ b/recipes/engine/femu_test.expected/multiple_non_root_fars.json
@@ -2659,7 +2659,6 @@
   {
     "cmd": [
       "vpython",
-      "-u",
       "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
       "--yaml_file",
       "[CACHE]/builder/src/flutter/testing/fuchsia/test_suites.yaml",
diff --git a/recipes/engine/femu_test.expected/start_femu_with_vdl.json b/recipes/engine/femu_test.expected/start_femu_with_vdl.json
index 9f4a409..81d9cbe 100644
--- a/recipes/engine/femu_test.expected/start_femu_with_vdl.json
+++ b/recipes/engine/femu_test.expected/start_femu_with_vdl.json
@@ -2661,7 +2661,6 @@
   {
     "cmd": [
       "vpython",
-      "-u",
       "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
       "--yaml_file",
       "[CACHE]/builder/src/flutter/testing/fuchsia/test_suites.yaml",
diff --git a/recipes/engine/scenarios.expected/with_failure_upload_0.json b/recipes/engine/scenarios.expected/with_failure_upload_0.json
index 9573967..708f830 100644
--- a/recipes/engine/scenarios.expected/with_failure_upload_0.json
+++ b/recipes/engine/scenarios.expected/with_failure_upload_0.json
@@ -222,7 +222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "install",
       "--avd-config",
@@ -270,7 +269,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "start",
       "--no-read-only",
@@ -1576,7 +1574,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder/src/flutter/testing/scenario_app",
diff --git a/recipes/engine/scenarios.expected/with_failure_upload_1.json b/recipes/engine/scenarios.expected/with_failure_upload_1.json
index c58fd1a..54bb014 100644
--- a/recipes/engine/scenarios.expected/with_failure_upload_1.json
+++ b/recipes/engine/scenarios.expected/with_failure_upload_1.json
@@ -222,7 +222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "install",
       "--avd-config",
@@ -270,7 +269,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "start",
       "--no-read-only",
@@ -1576,7 +1574,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "cwd": "[CACHE]/builder/src/flutter/testing/scenario_app",
diff --git a/recipes/engine/scenarios.expected/without_failure_upload_0.json b/recipes/engine/scenarios.expected/without_failure_upload_0.json
index 98bd17f..cd222e4 100644
--- a/recipes/engine/scenarios.expected/without_failure_upload_0.json
+++ b/recipes/engine/scenarios.expected/without_failure_upload_0.json
@@ -222,7 +222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "install",
       "--avd-config",
@@ -270,7 +269,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "start",
       "--no-read-only",
diff --git a/recipes/engine/scenarios.expected/without_failure_upload_1.json b/recipes/engine/scenarios.expected/without_failure_upload_1.json
index 98bd17f..cd222e4 100644
--- a/recipes/engine/scenarios.expected/without_failure_upload_1.json
+++ b/recipes/engine/scenarios.expected/without_failure_upload_1.json
@@ -222,7 +222,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "install",
       "--avd-config",
@@ -270,7 +269,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "start",
       "--no-read-only",
diff --git a/recipes/engine/web_engine.expected/windows-post-submit.json b/recipes/engine/web_engine.expected/windows-post-submit.json
index 7beb4bf..8283ab0 100644
--- a/recipes/engine/web_engine.expected/windows-post-submit.json
+++ b/recipes/engine/web_engine.expected/windows-post-submit.json
@@ -1033,7 +1033,6 @@
   {
     "cmd": [
       "vpython",
-      "-u",
       "RECIPE_MODULE[flutter::yaml]\\resources\\parse_yaml.py",
       "--yaml_file",
       "[CACHE]\\builder\\src\\flutter\\lib\\web_ui\\dev\\browser_lock.yaml",
diff --git a/recipes/engine/web_engine_drone.expected/linux-post-submit.json b/recipes/engine/web_engine_drone.expected/linux-post-submit.json
index 9feda12..9553c9e 100644
--- a/recipes/engine/web_engine_drone.expected/linux-post-submit.json
+++ b/recipes/engine/web_engine_drone.expected/linux-post-submit.json
@@ -268,7 +268,6 @@
   {
     "cmd": [
       "vpython",
-      "-u",
       "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
       "--yaml_file",
       "[CLEANUP]/builder/src/flutter/lib/web_ui/dev/browser_lock.yaml",
@@ -351,7 +350,6 @@
   {
     "cmd": [
       "vpython",
-      "-u",
       "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
       "--yaml_file",
       "[CLEANUP]/builder/src/flutter/lib/web_ui/dev/browser_lock.yaml",
diff --git a/recipes/flutter/android_views.expected/flutter_drive_clean_exit.json b/recipes/flutter/android_views.expected/flutter_drive_clean_exit.json
index b3176df..be5526f 100644
--- a/recipes/flutter/android_views.expected/flutter_drive_clean_exit.json
+++ b/recipes/flutter/android_views.expected/flutter_drive_clean_exit.json
@@ -289,7 +289,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "install",
       "--avd-config",
@@ -338,7 +337,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "start",
       "--no-read-only",
diff --git a/recipes/flutter/android_views.expected/flutter_drive_zombie_process.json b/recipes/flutter/android_views.expected/flutter_drive_zombie_process.json
index 23feb0e..2cf89f5 100644
--- a/recipes/flutter/android_views.expected/flutter_drive_zombie_process.json
+++ b/recipes/flutter/android_views.expected/flutter_drive_zombie_process.json
@@ -289,7 +289,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "install",
       "--avd-config",
@@ -338,7 +337,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "start",
       "--no-read-only",
diff --git a/recipes/flutter/deferred_components.expected/flutter_release_clean_exit.json b/recipes/flutter/deferred_components.expected/flutter_release_clean_exit.json
index 3808b10..681453b 100644
--- a/recipes/flutter/deferred_components.expected/flutter_release_clean_exit.json
+++ b/recipes/flutter/deferred_components.expected/flutter_release_clean_exit.json
@@ -289,7 +289,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "install",
       "--avd-config",
@@ -338,7 +337,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "start",
       "--no-read-only",
diff --git a/recipes/flutter/deferred_components.expected/flutter_release_zombie_process.json b/recipes/flutter/deferred_components.expected/flutter_release_zombie_process.json
index b6818b5..79b93c2 100644
--- a/recipes/flutter/deferred_components.expected/flutter_release_zombie_process.json
+++ b/recipes/flutter/deferred_components.expected/flutter_release_zombie_process.json
@@ -289,7 +289,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "install",
       "--avd-config",
@@ -338,7 +337,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "[CACHE]/avd/src/tools/android/avd/avd.py",
       "start",
       "--no-read-only",
diff --git a/recipes/ios-usb-dependencies.expected/ios-deploy with git_ref.json b/recipes/ios-usb-dependencies.expected/ios-deploy with git_ref.json
index e82ac04..2e41942 100644
--- a/recipes/ios-usb-dependencies.expected/ios-deploy with git_ref.json
+++ b/recipes/ios-usb-dependencies.expected/ios-deploy with git_ref.json
@@ -34,7 +34,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "name": "zipping ios-deploy dir",
diff --git a/recipes/ios-usb-dependencies.expected/ios-deploy with gitiles.json b/recipes/ios-usb-dependencies.expected/ios-deploy with gitiles.json
index 34904f3..e8dac94 100644
--- a/recipes/ios-usb-dependencies.expected/ios-deploy with gitiles.json
+++ b/recipes/ios-usb-dependencies.expected/ios-deploy with gitiles.json
@@ -70,7 +70,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "luci_context": {
diff --git a/recipes/ios-usb-dependencies.expected/libimobiledevice-flutter.json b/recipes/ios-usb-dependencies.expected/libimobiledevice-flutter.json
index 5f0e883..d331855 100644
--- a/recipes/ios-usb-dependencies.expected/libimobiledevice-flutter.json
+++ b/recipes/ios-usb-dependencies.expected/libimobiledevice-flutter.json
@@ -380,7 +380,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "luci_context": {
diff --git a/recipes/ios-usb-dependencies.expected/libplist-flutter.json b/recipes/ios-usb-dependencies.expected/libplist-flutter.json
index 4f2446a..9ac834c 100644
--- a/recipes/ios-usb-dependencies.expected/libplist-flutter.json
+++ b/recipes/ios-usb-dependencies.expected/libplist-flutter.json
@@ -250,7 +250,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "luci_context": {
diff --git a/recipes/ios-usb-dependencies.expected/openssl-flutter.json b/recipes/ios-usb-dependencies.expected/openssl-flutter.json
index 4d386dc..d1a0e57 100644
--- a/recipes/ios-usb-dependencies.expected/openssl-flutter.json
+++ b/recipes/ios-usb-dependencies.expected/openssl-flutter.json
@@ -276,7 +276,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "luci_context": {
diff --git a/recipes/ios-usb-dependencies.expected/usbmuxd-flutter.json b/recipes/ios-usb-dependencies.expected/usbmuxd-flutter.json
index ebdc782..a79f3f8 100644
--- a/recipes/ios-usb-dependencies.expected/usbmuxd-flutter.json
+++ b/recipes/ios-usb-dependencies.expected/usbmuxd-flutter.json
@@ -276,7 +276,6 @@
   {
     "cmd": [
       "python",
-      "-u",
       "RECIPE_MODULE[flutter::zip]/resources/zip.py"
     ],
     "luci_context": {
diff --git a/recipes/packages/packages.expected/master_channel.json b/recipes/packages/packages.expected/master_channel.json
index 395b1d3..8d4bd28 100644
--- a/recipes/packages/packages.expected/master_channel.json
+++ b/recipes/packages/packages.expected/master_channel.json
@@ -376,7 +376,6 @@
   {
     "cmd": [
       "vpython",
-      "-u",
       "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
       "--yaml_file",
       "[START_DIR]/packages/.ci/targets/tests.yaml",
diff --git a/recipes/packages/packages.expected/stable_channel.json b/recipes/packages/packages.expected/stable_channel.json
index 715c1be..93c164f 100644
--- a/recipes/packages/packages.expected/stable_channel.json
+++ b/recipes/packages/packages.expected/stable_channel.json
@@ -357,7 +357,6 @@
   {
     "cmd": [
       "vpython",
-      "-u",
       "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
       "--yaml_file",
       "[START_DIR]/packages/.ci/targets/tests.yaml",
diff --git a/recipes/plugins/plugins.expected/master_channel.json b/recipes/plugins/plugins.expected/master_channel.json
index 378dc0e..2da9b24 100644
--- a/recipes/plugins/plugins.expected/master_channel.json
+++ b/recipes/plugins/plugins.expected/master_channel.json
@@ -376,7 +376,6 @@
   {
     "cmd": [
       "vpython",
-      "-u",
       "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
       "--yaml_file",
       "[START_DIR]/plugins/.ci/targets/tests.yaml",
diff --git a/recipes/plugins/plugins.expected/stable_channel.json b/recipes/plugins/plugins.expected/stable_channel.json
index 7f35e4f..8b23060 100644
--- a/recipes/plugins/plugins.expected/stable_channel.json
+++ b/recipes/plugins/plugins.expected/stable_channel.json
@@ -357,7 +357,6 @@
   {
     "cmd": [
       "vpython",
-      "-u",
       "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
       "--yaml_file",
       "[START_DIR]/plugins/.ci/targets/tests.yaml",