If it’s that kind of flickering on KDE 6.X on Wayland that forced me to temporarily move back to Cinnamon on X to play Elden Ring again, it could be related to KDE enabling Explicit Sync by default and the NVidia drivers < 555 that don’t support it.
It was only flickering, the framerate was fine.
After I installed the 555 driver from the repository, the flickering in KDE on Wayland was gone.