A simple way to implement a fallback would be to maintain a backup file saved against the second FIDO device.
Backup 2FA methjod
I'll bet https://sourceforge.net/p/passwdsafe/wiki/SyncGoogleDrive/ is the answer.
An interesting diagnostic - I have two different Google accounts on this phone. Both have psafe3 files in their Drives. I tried this experiment: Uninstall PwSafe Sync Reinstall Use the non-default Google Drive account Get a permission dialog from Android psafe3 files are visible Uninstall PwSafe Sync Reinstall Use the DEFAULT Google Drive account NO permission dialog from Android psafe3 files are NOT visible
Note that this same error happened before the fresh install. I did the reinstall to see if it would fix the problem. My feeling about when this issue started is roughly the same as the build date - 11/04/2022.