Nvidia drivers stop working on testing after upgrade to kernel 6.12

Hi,

Yesterday Debian testing switched from 6.11 to 6.12.
After that upgrade my Nvidia drivers (535.216 from official testing 
repo) stop working (KDE Plasma 6.2).

I've fight with this for a whole day, but with no success. Symptoms:
  - SDDM cannot open X for login screen ("failed to read display number 
from pipe")
  - so black screen after reboot
  - X reports: failed to open /dev/dri/card0 (invalid argument)

Tried everything (reinstalling nvidia-driver to compile modules for new 
kernel during installation etc).

Finally successfully restored my Debian testing by installing Nvidia 
Debian drivers from their official web page (version 550 right now).
Graphics is not so good (as it was on official Debian testing repo - for 
example google-chrome-stable has some glitches), but desktop environment 
works fine.

Any advice or experiences from other Nvidia driver users on Debian testing?

Regards,
Rafal