I suspect that to be an issue with XWayland and the game not hitting the fps matching you screen refresh rate.
This should be fixed if:
- XWayland patches this for nvidia
- or Wine / Proton having proper Wayland support
- or Nvidia patches their driver for glamour to work correctly
- or Switching to X11
- or NVK becoming production ready and users can make use of the open source driver stack
See the attached Bug report for XWayland:
I am affected by this issue as well even by games running on 1080p@60 fps when the game gets busy doing something and therefore the fps get below 60.