Entering incorrect password resets login form 1 second later
- Enter incorrect password and press Enter.
- GDM tells you the password was incorrect.
- 1 second later GDM clears the login form saying "Authentication error".
If you have mistyped your password and naturally start re-entering it again as soon as you can, then it's cleared and you have to start entering it again from scratch.
I'm fairly certain this only happens when fingerprint unlock is active.
Fedora 32, gdm-3.36.3-1.fc32.x86_64, Lenovo ThinkPad T495s.