gamescope
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Mouse cursor is inverted when using with old Windows games running via Proton, also it doesn't scale

This is game called NosTale, running on Steam Proton. If I remember correctly, when I was testing game with pure Wine, I encountered the same bug (cursor colors being inverted - by default, cursor color is yellow), but not on every wine version, so I'm not really sure if this is gamescope or/and wine fault.
Also the game cursor is not scaled, but this is probably little duplicate of: https://github.com/Plagman/gamescope/issues/12
Please try without gamescope, and check whether colors are inverted there too.
I can confirm this bug is gamescope-releated, I tried to run game without gamescope and I have normal cursor colors.
This is probably swapped channels rather than inversion. I remember seeing the same thing with Planetary Annihilation back then so maybe that same bug creeped back in.
Seeing this issue with Arx Fatalis