diff --git a/recipes/devicelab/devicelab_drone_build_test.expected/artifact does not exist.json b/recipes/devicelab/devicelab_drone_build_test.expected/artifact does not exist.json
index 2c9c712..66353fd 100644
--- a/recipes/devicelab/devicelab_drone_build_test.expected/artifact does not exist.json
+++ b/recipes/devicelab/devicelab_drone_build_test.expected/artifact does not exist.json
@@ -844,7 +844,7 @@
       }
     },
     "name": "launch builds.schedule",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"test\"}, \"dimensions\": [{\"key\": \"os\", \"value\": \"Linux\"}], \"exe\": {\"cipdVersion\": \"refs/heads/main\"}, \"experimental\": \"NO\", \"experiments\": {\"luci.buildbucket.parent_tracking\": false}, \"fields\": \"builder,createTime,createdBy,critical,endTime,id,infra,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"git.example.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"test/repo\", \"ref\": \"refs/heads/main\"}, \"priority\": 30, \"properties\": {\"$flutter/osx_sdk\": {}, \"artifact\": \"def\", \"build\": {\"drone_dimensions\": [\"os=Linux\"], \"name\": \"abc\", \"properties\": {\"$flutter/osx_sdk\": {}, \"artifact\": \"def\", \"dependencies\": [], \"git_branch\": \"master\", \"parent_builder\": \"Linux abc\", \"tags\": [], \"task_name\": \"abc\"}, \"recipe\": \"devicelab/devicelab_test_drone\"}, \"dependencies\": [], \"drone_dimensions\": [\"os=Linux\"], \"gclient_variables\": {}, \"git_branch\": \"master\", \"git_ref\": \"refs/pull/1/head\", \"parent_builder\": \"Linux abc\", \"recipe\": \"devicelab/devicelab_test_drone\", \"tags\": [], \"task_name\": \"abc\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"parent_buildbucket_id\", \"value\": \"8945511751514863184\"}, {\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"test\"}, \"dimensions\": [{\"key\": \"os\", \"value\": \"Linux\"}], \"exe\": {\"cipdVersion\": \"refs/heads/main\"}, \"experimental\": \"NO\", \"experiments\": {\"luci.buildbucket.parent_tracking\": false}, \"fields\": \"builder,createTime,createdBy,critical,endTime,id,infra,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"git.example.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"test/repo\", \"ref\": \"refs/heads/main\"}, \"priority\": 30, \"properties\": {\"$flutter/osx_sdk\": {}, \"artifact\": \"def\", \"build\": {\"drone_dimensions\": [\"os=Linux\"], \"name\": \"abc\", \"properties\": {\"$flutter/osx_sdk\": {}, \"artifact\": \"def\", \"dependencies\": [], \"git_branch\": \"master\", \"os\": \"Linux\", \"parent_builder\": \"Linux abc\", \"tags\": [], \"task_name\": \"abc\"}, \"recipe\": \"devicelab/devicelab_test_drone\"}, \"dependencies\": [], \"drone_dimensions\": [\"os=Linux\"], \"gclient_variables\": {}, \"git_branch\": \"master\", \"git_ref\": \"refs/pull/1/head\", \"os\": \"Linux\", \"parent_builder\": \"Linux abc\", \"recipe\": \"devicelab/devicelab_test_drone\", \"tags\": [], \"task_name\": \"abc\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"parent_buildbucket_id\", \"value\": \"8945511751514863184\"}, {\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -905,6 +905,7 @@
       "@@@STEP_LOG_LINE@request@              \"artifact\": \"def\",@@@",
       "@@@STEP_LOG_LINE@request@              \"dependencies\": [],@@@",
       "@@@STEP_LOG_LINE@request@              \"git_branch\": \"master\",@@@",
+      "@@@STEP_LOG_LINE@request@              \"os\": \"Linux\",@@@",
       "@@@STEP_LOG_LINE@request@              \"parent_builder\": \"Linux abc\",@@@",
       "@@@STEP_LOG_LINE@request@              \"tags\": [],@@@",
       "@@@STEP_LOG_LINE@request@              \"task_name\": \"abc\"@@@",
@@ -918,6 +919,7 @@
       "@@@STEP_LOG_LINE@request@          \"gclient_variables\": {},@@@",
       "@@@STEP_LOG_LINE@request@          \"git_branch\": \"master\",@@@",
       "@@@STEP_LOG_LINE@request@          \"git_ref\": \"refs/pull/1/head\",@@@",
+      "@@@STEP_LOG_LINE@request@          \"os\": \"Linux\",@@@",
       "@@@STEP_LOG_LINE@request@          \"parent_builder\": \"Linux abc\",@@@",
       "@@@STEP_LOG_LINE@request@          \"recipe\": \"devicelab/devicelab_test_drone\",@@@",
       "@@@STEP_LOG_LINE@request@          \"tags\": [],@@@",
diff --git a/recipes/devicelab/devicelab_drone_build_test.expected/artifact exists.json b/recipes/devicelab/devicelab_drone_build_test.expected/artifact exists.json
index 2ee227f..0ab6cf0 100644
--- a/recipes/devicelab/devicelab_drone_build_test.expected/artifact exists.json
+++ b/recipes/devicelab/devicelab_drone_build_test.expected/artifact exists.json
@@ -38,7 +38,7 @@
     ],
     "infra_step": true,
     "name": "launch builds.schedule",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"builder\": \"Linux Engine Drone\"}, \"dimensions\": [{\"key\": \"os\", \"value\": \"Linux\"}], \"exe\": {\"cipdVersion\": \"refs/heads/main\"}, \"experimental\": \"NO\", \"experiments\": {\"luci.buildbucket.parent_tracking\": false}, \"fields\": \"builder,createTime,createdBy,critical,endTime,id,infra,input,number,output,startTime,status,updateTime\", \"priority\": 30, \"properties\": {\"$flutter/osx_sdk\": {}, \"artifact\": \"def\", \"build\": {\"drone_dimensions\": [\"os=Linux\"], \"name\": \"abc\", \"properties\": {\"$flutter/osx_sdk\": {}, \"artifact\": \"def\", \"dependencies\": [], \"git_branch\": \"master\", \"parent_builder\": \"Linux abc\", \"tags\": [], \"task_name\": \"abc\"}, \"recipe\": \"devicelab/devicelab_test_drone\"}, \"dependencies\": [], \"drone_dimensions\": [\"os=Linux\"], \"gclient_variables\": {}, \"git_branch\": \"master\", \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"test/repo\", \"parent_builder\": \"Linux abc\", \"recipe\": \"devicelab/devicelab_test_drone\", \"tags\": [], \"task_name\": \"abc\"}, \"requestId\": \"0-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"parent_buildbucket_id\", \"value\": \"0\"}, {\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"builder\": \"Linux Engine Drone\"}, \"dimensions\": [{\"key\": \"os\", \"value\": \"Linux\"}], \"exe\": {\"cipdVersion\": \"refs/heads/main\"}, \"experimental\": \"NO\", \"experiments\": {\"luci.buildbucket.parent_tracking\": false}, \"fields\": \"builder,createTime,createdBy,critical,endTime,id,infra,input,number,output,startTime,status,updateTime\", \"priority\": 30, \"properties\": {\"$flutter/osx_sdk\": {}, \"artifact\": \"def\", \"build\": {\"drone_dimensions\": [\"os=Linux\"], \"name\": \"abc\", \"properties\": {\"$flutter/osx_sdk\": {}, \"artifact\": \"def\", \"dependencies\": [], \"git_branch\": \"master\", \"os\": \"Linux\", \"parent_builder\": \"Linux abc\", \"tags\": [], \"task_name\": \"abc\"}, \"recipe\": \"devicelab/devicelab_test_drone\"}, \"dependencies\": [], \"drone_dimensions\": [\"os=Linux\"], \"gclient_variables\": {}, \"git_branch\": \"master\", \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"test/repo\", \"os\": \"Linux\", \"parent_builder\": \"Linux abc\", \"recipe\": \"devicelab/devicelab_test_drone\", \"tags\": [], \"task_name\": \"abc\"}, \"requestId\": \"0-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"parent_buildbucket_id\", \"value\": \"0\"}, {\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -89,6 +89,7 @@
       "@@@STEP_LOG_LINE@request@              \"artifact\": \"def\",@@@",
       "@@@STEP_LOG_LINE@request@              \"dependencies\": [],@@@",
       "@@@STEP_LOG_LINE@request@              \"git_branch\": \"master\",@@@",
+      "@@@STEP_LOG_LINE@request@              \"os\": \"Linux\",@@@",
       "@@@STEP_LOG_LINE@request@              \"parent_builder\": \"Linux abc\",@@@",
       "@@@STEP_LOG_LINE@request@              \"tags\": [],@@@",
       "@@@STEP_LOG_LINE@request@              \"task_name\": \"abc\"@@@",
@@ -103,6 +104,7 @@
       "@@@STEP_LOG_LINE@request@          \"git_branch\": \"master\",@@@",
       "@@@STEP_LOG_LINE@request@          \"git_ref\": \"refs/pull/1/head\",@@@",
       "@@@STEP_LOG_LINE@request@          \"git_url\": \"test/repo\",@@@",
+      "@@@STEP_LOG_LINE@request@          \"os\": \"Linux\",@@@",
       "@@@STEP_LOG_LINE@request@          \"parent_builder\": \"Linux abc\",@@@",
       "@@@STEP_LOG_LINE@request@          \"recipe\": \"devicelab/devicelab_test_drone\",@@@",
       "@@@STEP_LOG_LINE@request@          \"tags\": [],@@@",
diff --git a/recipes/devicelab/devicelab_drone_build_test.expected/local-engine.json b/recipes/devicelab/devicelab_drone_build_test.expected/local-engine.json
index 9e30027..36b479a 100644
--- a/recipes/devicelab/devicelab_drone_build_test.expected/local-engine.json
+++ b/recipes/devicelab/devicelab_drone_build_test.expected/local-engine.json
@@ -1028,7 +1028,7 @@
       }
     },
     "name": "launch builds.schedule",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"test\"}, \"dimensions\": [{\"key\": \"os\", \"value\": \"Linux\"}], \"exe\": {\"cipdVersion\": \"refs/heads/main\"}, \"experimental\": \"NO\", \"experiments\": {\"luci.buildbucket.parent_tracking\": false}, \"fields\": \"builder,createTime,createdBy,critical,endTime,id,infra,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"git.example.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"test/repo\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"$flutter/osx_sdk\": {}, \"artifact\": \"def\", \"build\": {\"drone_dimensions\": [\"os=Linux\"], \"name\": \"abc\", \"properties\": {\"$flutter/osx_sdk\": {}, \"artifact\": \"def\", \"dependencies\": [], \"git_branch\": \"master\", \"parent_builder\": \"Linux abc\", \"tags\": [], \"task_name\": \"abc\"}, \"recipe\": \"devicelab/devicelab_test_drone\"}, \"dependencies\": [], \"drone_dimensions\": [\"os=Linux\"], \"gclient_variables\": {}, \"git_branch\": \"master\", \"local_engine\": \"android-release\", \"local_engine_cas_hash\": \"isolatehashlocalengine/22\", \"local_engine_host\": \"host-release\", \"parent_builder\": \"Linux abc\", \"recipe\": \"devicelab/devicelab_test_drone\", \"tags\": [], \"task_name\": \"abc\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"parent_buildbucket_id\", \"value\": \"8945511751514863184\"}, {\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"test\"}, \"dimensions\": [{\"key\": \"os\", \"value\": \"Linux\"}], \"exe\": {\"cipdVersion\": \"refs/heads/main\"}, \"experimental\": \"NO\", \"experiments\": {\"luci.buildbucket.parent_tracking\": false}, \"fields\": \"builder,createTime,createdBy,critical,endTime,id,infra,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"git.example.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"test/repo\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"$flutter/osx_sdk\": {}, \"artifact\": \"def\", \"build\": {\"drone_dimensions\": [\"os=Linux\"], \"name\": \"abc\", \"properties\": {\"$flutter/osx_sdk\": {}, \"artifact\": \"def\", \"dependencies\": [], \"git_branch\": \"master\", \"os\": \"Linux\", \"parent_builder\": \"Linux abc\", \"tags\": [], \"task_name\": \"abc\"}, \"recipe\": \"devicelab/devicelab_test_drone\"}, \"dependencies\": [], \"drone_dimensions\": [\"os=Linux\"], \"gclient_variables\": {}, \"git_branch\": \"master\", \"local_engine\": \"android-release\", \"local_engine_cas_hash\": \"isolatehashlocalengine/22\", \"local_engine_host\": \"host-release\", \"os\": \"Linux\", \"parent_builder\": \"Linux abc\", \"recipe\": \"devicelab/devicelab_test_drone\", \"tags\": [], \"task_name\": \"abc\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"parent_buildbucket_id\", \"value\": \"8945511751514863184\"}, {\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -1089,6 +1089,7 @@
       "@@@STEP_LOG_LINE@request@              \"artifact\": \"def\",@@@",
       "@@@STEP_LOG_LINE@request@              \"dependencies\": [],@@@",
       "@@@STEP_LOG_LINE@request@              \"git_branch\": \"master\",@@@",
+      "@@@STEP_LOG_LINE@request@              \"os\": \"Linux\",@@@",
       "@@@STEP_LOG_LINE@request@              \"parent_builder\": \"Linux abc\",@@@",
       "@@@STEP_LOG_LINE@request@              \"tags\": [],@@@",
       "@@@STEP_LOG_LINE@request@              \"task_name\": \"abc\"@@@",
@@ -1104,6 +1105,7 @@
       "@@@STEP_LOG_LINE@request@          \"local_engine\": \"android-release\",@@@",
       "@@@STEP_LOG_LINE@request@          \"local_engine_cas_hash\": \"isolatehashlocalengine/22\",@@@",
       "@@@STEP_LOG_LINE@request@          \"local_engine_host\": \"host-release\",@@@",
+      "@@@STEP_LOG_LINE@request@          \"os\": \"Linux\",@@@",
       "@@@STEP_LOG_LINE@request@          \"parent_builder\": \"Linux abc\",@@@",
       "@@@STEP_LOG_LINE@request@          \"recipe\": \"devicelab/devicelab_test_drone\",@@@",
       "@@@STEP_LOG_LINE@request@          \"tags\": [],@@@",
diff --git a/recipes/devicelab/devicelab_drone_build_test.expected/xcode-mac.json b/recipes/devicelab/devicelab_drone_build_test.expected/xcode-mac.json
index 9aadaed..cfc1b9d 100644
--- a/recipes/devicelab/devicelab_drone_build_test.expected/xcode-mac.json
+++ b/recipes/devicelab/devicelab_drone_build_test.expected/xcode-mac.json
@@ -2051,7 +2051,7 @@
       }
     },
     "name": "launch builds.schedule",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Mac Engine Drone\", \"project\": \"project\"}, \"dimensions\": [{\"key\": \"os\", \"value\": \"Mac\"}], \"exe\": {\"cipdVersion\": \"refs/heads/main\"}, \"experimental\": \"NO\", \"experiments\": {\"luci.buildbucket.parent_tracking\": false}, \"fields\": \"builder,createTime,createdBy,critical,endTime,id,infra,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"project\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"$flutter/osx_sdk\": {\"sdk_version\": \"deadbeef\"}, \"artifact\": \"abc\", \"build\": {\"drone_dimensions\": [\"os=Mac\"], \"name\": \"abc\", \"properties\": {\"$flutter/osx_sdk\": {\"sdk_version\": \"deadbeef\"}, \"artifact\": \"abc\", \"dependencies\": [], \"git_branch\": \"master\", \"parent_builder\": \"Mac_ios abc\", \"tags\": [\"ios\"], \"task_name\": \"abc\"}, \"recipe\": \"devicelab/devicelab_test_drone\"}, \"dependencies\": [], \"drone_dimensions\": [\"os=Mac\"], \"gclient_variables\": {}, \"git_branch\": \"master\", \"parent_builder\": \"Mac_ios abc\", \"recipe\": \"devicelab/devicelab_test_drone\", \"tags\": [\"ios\"], \"task_name\": \"abc\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"parent_buildbucket_id\", \"value\": \"8945511751514863184\"}, {\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Mac Engine Drone\", \"project\": \"project\"}, \"dimensions\": [{\"key\": \"os\", \"value\": \"Mac\"}], \"exe\": {\"cipdVersion\": \"refs/heads/main\"}, \"experimental\": \"NO\", \"experiments\": {\"luci.buildbucket.parent_tracking\": false}, \"fields\": \"builder,createTime,createdBy,critical,endTime,id,infra,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"project\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"$flutter/osx_sdk\": {\"sdk_version\": \"deadbeef\"}, \"artifact\": \"abc\", \"build\": {\"drone_dimensions\": [\"os=Mac\"], \"name\": \"abc\", \"properties\": {\"$flutter/osx_sdk\": {\"sdk_version\": \"deadbeef\"}, \"artifact\": \"abc\", \"dependencies\": [], \"git_branch\": \"master\", \"os\": \"Mac\", \"parent_builder\": \"Mac_ios abc\", \"tags\": [\"ios\"], \"task_name\": \"abc\"}, \"recipe\": \"devicelab/devicelab_test_drone\"}, \"dependencies\": [], \"drone_dimensions\": [\"os=Mac\"], \"gclient_variables\": {}, \"git_branch\": \"master\", \"os\": \"Mac\", \"parent_builder\": \"Mac_ios abc\", \"recipe\": \"devicelab/devicelab_test_drone\", \"tags\": [\"ios\"], \"task_name\": \"abc\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"parent_buildbucket_id\", \"value\": \"8945511751514863184\"}, {\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -2116,6 +2116,7 @@
       "@@@STEP_LOG_LINE@request@              \"artifact\": \"abc\",@@@",
       "@@@STEP_LOG_LINE@request@              \"dependencies\": [],@@@",
       "@@@STEP_LOG_LINE@request@              \"git_branch\": \"master\",@@@",
+      "@@@STEP_LOG_LINE@request@              \"os\": \"Mac\",@@@",
       "@@@STEP_LOG_LINE@request@              \"parent_builder\": \"Mac_ios abc\",@@@",
       "@@@STEP_LOG_LINE@request@              \"tags\": [@@@",
       "@@@STEP_LOG_LINE@request@                \"ios\"@@@",
@@ -2130,6 +2131,7 @@
       "@@@STEP_LOG_LINE@request@          ],@@@",
       "@@@STEP_LOG_LINE@request@          \"gclient_variables\": {},@@@",
       "@@@STEP_LOG_LINE@request@          \"git_branch\": \"master\",@@@",
+      "@@@STEP_LOG_LINE@request@          \"os\": \"Mac\",@@@",
       "@@@STEP_LOG_LINE@request@          \"parent_builder\": \"Mac_ios abc\",@@@",
       "@@@STEP_LOG_LINE@request@          \"recipe\": \"devicelab/devicelab_test_drone\",@@@",
       "@@@STEP_LOG_LINE@request@          \"tags\": [@@@",
diff --git a/recipes/devicelab/devicelab_drone_build_test.py b/recipes/devicelab/devicelab_drone_build_test.py
index 0362206..414c741 100644
--- a/recipes/devicelab/devicelab_drone_build_test.py
+++ b/recipes/devicelab/devicelab_drone_build_test.py
@@ -113,9 +113,13 @@
               api.properties.get('$flutter/osx_sdk', {})
           ),
   }
+  drone_dimensions = api.properties.get('drone_dimensions', [])
+  for d in drone_dimensions:
+        k, v = d.split('=')
+        test_props[k] = v
   reqs.append({
       'name': task_name, 'properties': test_props,
-      'drone_dimensions': api.properties.get('drone_dimensions', []),
+      'drone_dimensions': drone_dimensions,
       'recipe': 'devicelab/devicelab_test_drone'
   })
   return reqs
diff --git a/recipes/devicelab/devicelab_test_drone.py b/recipes/devicelab/devicelab_test_drone.py
index 52a4f0b..49febc8 100644
--- a/recipes/devicelab/devicelab_test_drone.py
+++ b/recipes/devicelab/devicelab_test_drone.py
@@ -125,6 +125,10 @@
       if str(api.swarming.bot_id).startswith('flutter-devicelab'):
         with api.osx_sdk('ios', devicelab=True):
           with api.context(env=env, env_prefixes=env_prefixes):
+            # Next steps get executed only if running in mac.
+            api.os_utils.prepare_ios_device()
+            api.os_utils.shutdown_simulators()
+            api.os_utils.ios_debug_symbol_doctor()
             run_test(api, task_name, runner_params)
 
   with api.context(env=env, env_prefixes=env_prefixes, cwd=devicelab_path):