These two builders in particular have been consistently timing out:

https://ci.chromium.org/ui/p/flutter/builders/luci.flutter.prod/Mac_arm64_mokey%20entrypoint_dart_registrant?limit=200
https://ci.chromium.org/ui/p/flutter/builders/luci.flutter.prod/Mac_arm64_mokey%20native_assets_android

It appears they are stuck downloading or installing Android build tools:

[2025-12-05 11:48:53.937128] [STDOUT] stdout: [        ] Preparing "Install Android SDK Build-Tools 35 v.35.0.0".