New in RN 0.54, Debugging on Android no longer resolve source maps

[aarondail]

Prior to Android 0.54 (at least as of 0.52.2) when I run my app on iOS or Android and turn on JS Debugging, then in Chrome I can find, see, and debug my source files (rather than the bundled file).

As of 0.54, this still seems to work on iOS, but no longer works on Android.

Environment

Environment:
  OS: macOS Sierra 10.12.6
  Node: 9.8.0
  Yarn: 1.5.1
  npm: 5.6.0
  Watchman: 4.5.0
  Xcode: Xcode 9.2 Build version 9C40b
  Android Studio: 2.3 AI-162.3934792

Packages: (wanted => installed)
  react: ^16.3.0-alpha.1 => 16.3.0-alpha.2
  react-native: 0.54.2 => 0.54.2

Expected Behavior

When I run a RN app on Android, and launch the Chrome debugger I can see my source files, and debug them.

Actual Behavior

I can only see and debug the bundled file.

Steps to Reproduce

Create a sample app using react-native init and run it on Android, and start JS Debugging. Note that you can't find App.js via CMD+P and on the console lists all statements as coming from some blob:http.... path. E.g.

NOTE you can workaround this by going to the dev settings (via CMD+M) and turning OFF Use JS Deltas