React Native - cannot connect to Metro on API 31/32 (Android 12) either on emulator or real device, even with adb reverse

Cleartext is enabled in the manifest.I have done adb reverse tcp:8081 tcp:8081 command.The same app readily works on an API 28 emulator.

I get the message Could not connect to development server.

Is there another reason why Android 12 might cause problems with this?

Thanks :)