No keyboard shown to enter password with locked screen

After several months of flawless use, I decided to activate fingerprint and password protection.
The problem is that after a reboot, a fingerprint isn’t sufficient for unlocking, and when asked for the password, no keyboard shows up, so I just can’t enter the password.
I installed via F-Droid and use AnySoft keyboard, can that be the cause?
For now, I didn’t find any solution other than factory reset, which I’d like to avoid since I dont have recent backups. And would a keyboard connected via USB allow me to enter the password?

2 posts were merged into an existing topic: Fairphone 3 Keyboard doesn’t show up on lock screen