It looks like clearing all joplinapp data, running adb shell cmd appops set net.cozic.joplin android:no_isolated_storage allow && adb shell cmd appops set net.cozic.joplin android:legacy_storage allow && adb shell am force-stop net.cozic.joplin again, and enabling storage permissions has fixed the problem. at first the notes would not decrypt, but I forced stopped the app and reopened, which fixed that problem.
I'm not sure what is going on now... Syncthing on my computer says "syncing 70%" and is counting down, Syncthing on my phone says syncing "Idle" and joplin says
Updated remote Items: * (counting up)
Decrypting items */100 counting to 100 and then restarting
I don't know if this means there is conflict as Joplin mobile is performing synchronization... I have syncthing on android set to "receive only" so that none of the files on my PC are changed before the apps are configured correctly, but this may be the source of the problem.