When I lock the screen and I try to make the unlock screen visible by moving the mouse or typing something, the screen remains blank. I can see only the pointer on the screen, and nothing else. I still able to unlock the screen by typing the password blindly, but I can't see the input field. It happens randomly, so the unlock screen is visible sometimes after lock, but invisible most of the time. It happens only with the Plasma (X11) session, the Wayland session works fine.

STEPS TO REPRODUCE
1. Login into the Plasma (X11) session.
2. Lock the screen from the main menu or with Meta-L keyboard shortcut.
3. Move the mouse or type something.

OBSERVED RESULT
The unlock screen is blank, only the pointer is shown on the screen.

EXPECTED RESULT
The unlock screen should be visible.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
KDE Plasma Version: 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2