Flutter splash screen are deprecated: https://docs.flutter.dev/development/ui/advanced/splash-screen#migrating-from-manifest--activity-defined-custom-splash-screens

There are a number of apps that add the metadata io.flutter.embedding.android.SplashScreenDrawable to AndroidManifest.xml in g3.

Recently, the logic that lookups the drawable in the embedding is causing some issues on Android T beta.
See http://b/234598486, and http://b/231425885

This code can be removed from the engine assuming all 1P clients can be migrated.