Same here:
Gboard version: 12.8.12.514733254-release-arm64-v8a
Device: Samsung Galaxy Note20
It happens in source mode
I can’t use the Samsung key board because it generates red dots and corrupts the entire file. Therefore I switched to Gboard and now there is this issue.
I think it is time to really look into the android version of obsidian and fix these keyboard issues.