It is not possible to unlock the screen when a nondefault layout was active right before the screen lock.
A system with at least two non-compatible keyboard layouts. For example: us and ua (cyrillic).
Steps to reproduce:
- Have at least two non-compatible keyboard layouts
- Switch to the keyboard layout that does not contain symbols in your password
- Lock the screen (Super + L or go to make a cup of tea)
- Now you can't log back in