Note the backspace behavior
https://video.nostr.build/c7dfa00a9feac04d060aaf2e3858aac650139b4de9ec4b379d30a8a92654efa6.mp4
I think many of these keyboard issues are related to the autocorrect mode of the default keyboard. I think somebody was able to disable the autocorrect and it also started working.
nostr:nprofile1qy2hwumn8ghj7mn0wd68ytn00p68ytnyv4mz7qgmwaehxw309aex2mrp0yhxummnw3e8qmr9vfejucm0d5hsz9thwden5te0wfjkccte9ehx7um5wghxyee0qqsr5hx0nu0va5508g6dk9mq2nchurlz2jf2x0tnfdxqfq4qngn4ajsh4jmln do you want do a post on the keyboards that you have tried? I would love to have it so that I can share with GrapheneOS folks that are having the same issue. I think most people have never thought about changing the keyboard and just bash Graphene/Amethyst for the instability.
Discussion
Yep, that is a well known issue in the default keyboard of Graphene when using with Jetpack Compose apps.