When I switch from main profile to a secondary, then end the session in the secondary profile and thus get back to the main profile, the phone doesn't prompt for my fingerprint to unlock it anymore.
I know this is expected behavior when you first unlock a profile after switching, but the phone doesn't prompt for fingerprint unlock at all if I used a secondary profile before. Like, even once I unlocked the main profile and use it for hours, I just never get the option to unlock the phone with my fingerprint anymore, it only prompt for my password.
Only restarting the phone resolves the bug.
I did not have this issue before, I suspect that it was introduced by a recent update.
P.S. I use a password instead of a PIN. I don't know if it might be useful to know.