Hello,
I recently bought myself a new smartphone, after my Google Pixel 2XL run out of system and security updates. Since that time I can't unlock the apps, which I added to the <Option> <App-lock> with my fingerprint no more.
The window doesn't react anymore, and I have to minimize or close it to get access to the <Unlock with PIN> option. That is annoying and not really comfortable. I guess it must be the new device, because with the older everything worked proper.
The new Google Pixel 4a (5G) runs on Andriod 11 with all current updates.
Meanwhile, I have deactivated this option, but for me this isn't a really secure solution. Any help is appreciated.