I want to second this. Bitwarden autofill used to fail on all chrome based browsers when Android 13 was first released. But now, I tried using Brave on Graphene and the autofill works. Only on Vanadium did it not work.
Granted that I turned accessibility on for this to work, but even then, was expecting that to work on Vanadium. I don't mind turning this on because I trust both Graphene and Bitwarden.
Lmk if you need further info :)