This bug is related to SDDM, not plasmashell, but I was unable to find the appropriate category where sddm it is.

SUMMARY
In a dual monitor setup, the SDDM is duplicated on both screens, which is fine
Before 6.2.0, I could type my password on any screen/monitor and the login succeeded.
Now, on 6.2.1 if I type my password on secondary/to-the right monitor and press ENTER (or click on the arrow next to password input field), the screen brightness is lowered but no login, no error, nothing happens.
Than, I move the mouse to the first/to-the-left monitor and type the password and the login succeeded .

STEPS TO REPRODUCE
1.  type your password on the secondary monitor and press ENTER
2. 
3. 

OBSERVED RESULT
The screen brightness has a slight decrease in brightness  but nothing else. No error but no login.
If I move the mouse to screen to the left, and type the password and ENTER, login succeeds as expected.

EXPECTED RESULT
Using the left or right login screens should work.

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20241017
KDE Plasma Version: 6.2.1
KDE Frameworks Version: 6.7.0
Qt Version: 6.8.0
Kernel Version: 6.11.3-1-default (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 7600X 6-Core Processor
Memory: 30.6 GiB of RAM
Graphics Processor: AMD Radeon RX 6600

ADDITIONAL INFORMATION
Any screen used to work before 6.2.0