Hello @Rexpulli, can you test how this game behaves with a GNOME/X user session instead of a GNOME/Wayland user session? Using the NVIDIA proprietary driver with Wayland compositors doesn't have an established history of being reliable at this point.
It was indeed a XWayland/NVIDIA problem, I'll make sure to always test in a GNOME/X session as well from now on.
steam-470780.log
Since the game has no other issues, I suppose this should've been a Whitelist request instead.
Nothing extracted yet.
Compatibility Report
System Information
I confirm:
Symptoms
Unresponsive black window with sound on after Alt-Tab.
Reproduction
Alt-Tab away from and back to the game window.
steam-470780.log