Graphical error: square-shaped flickering

[synthohol]

I just encountered this strange graphical error where there are flickering squares on surfaces hit by light. Luckily, I was able to catch them in a screenshot. They appear randomly on surfaces and are not limited to the particular ingame location as seen in screenshots.

I tried the usual and some unusual stuff:

• rebooted PC
  
• updated OS and drivers
  
• verified game files
  
• reinstalled game (actually twice: native Linux version and Proton-powered Windows version)
  
• changed resolution from 2560x1440 to 1920x1080
  
• set ingame FPS limiter at 30 fps, 60 fps and unlocked
  
• disbled and enabled V-Sync ingame
  
• checked windowed, borderless, and exclusive mode
  
• lowered and raised texture scaling
  
• set refresh rate in OS to 60 Hz, 120 Hz, 144 Hz and 165 Hz
  
• set different color profiles (none, integrated, manufacturer's ICM-file)
  
• disabled and enabled FreeSync both in graphics settings an on my display
  
• tried different cables (both HDMI and DP)
  
• tried another display (just 1080p)
  
• tried Wayland and X11 display server

I'm stumped because in none of the other games I frequently play (American Truck Simulator, Valheim) I experience anything similar. I'm somwehat suspecting my GPU to be the culprit as I changed it some time ago, and haven't played Stray since then. I previously had a Nvidia GTX 1060 which I replaced with an AMD Radeon RX 7800 XT. The GTX 1060 provided a smooth 1080p 60 fps experience with fairly high settings and not a single graphical error. This was true when using either X11 or Wayland display server. The RX 7800 XT obviously delivers a smooth experience at 2K 60 fps as well, however now I get this strange flickering.

Any help is greatly appreciated!

Some system specs for the sake of completeness:

• CPU: Intel Core i7 6700K
  
• RAM: 32 GB DDR 2133 MHz
  
• SSD: Samsung 970 Evo Plus 500 GB
  
• GPU: AMD Radeon RX 7800 XT
  
• OS: EndeavourOS, Linux 6.13.7-arch1-1 Kernel
  
• DE: KDE Plasma 6.3.3, Wayland

[synthohol]

Here's a screenshot:
https://steamcommunity.com/sharedfiles/filedetails/?id=3448386678

There are some orange rectangles on the wall. These appear all over the place, where there are light reflections.

Unfornuately, I found a similar error in another game (Bright Memory: Infinite), which makes me think this isn't related to Stray but to something on my PC.