Edit: Check my comment on how I solved it. TL,DR: manually delete and reinstall the Steam Linux Runtimes

I got Forza Horizon 6 for my birthday a couple of days ago and beside some small audio issues it was working completely fine (1440p mostly high and ultra settings 60-70FPS) with GE-Proton11.1 and PROTON_ENABLE_HDR=1 PROTON_ENABLE_WAYLAND=1

I've played it for nearly 9h already. Today the game is freezing at the first frame after the epilepsy and so on warnings.

I've tried different Proton Versions (Experimental, Hotfix, Official 10 and 11, GE 10 and 11), no launch args and some of the launch args that I found on ProtonDB, restarted the PC and verified the game files, all to no avail.

I've heard that the game was being difficult at launch, but it was working great, but now for some reason it doesn't run anymore.

Maybe one of you wizards has some ideas, would be much appreciated.

Distro: Debian 13 with KDE

Specs:

Ryzen 3950X

64GB DDR4 3200

Asus Prime X570 Pro MB

Nvidia 2080 Super 8GB with latest 610.43 drivers (from Nvidias Repo, Not Debians)