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Gamescope problems with fullscreen/maximized windows on Plasma 6.1?

I was recently experimenting with using Gamescope to check whether HDR works on Plasma.

The games run perfectly if I set the compositor resolution (via -W and -H arguments) to a lower value like 1920x1080 (I have a 1440p monitor). But if I were to maximize the compositor window or make it fullscreen (via the Super + F shortcut), the window becomes invisible and I see my desktop. In case of maximizing, the title bar is visible but nothing else.

I have not set --expose-wayland since games don't even start when I set that. When running gamescope with Steam integration (via the -e argument), steam starts and I am also able to make it fullscreen without any issues, but when I launch a game, I only see the Steam window.

During this time, I can hear the audio from the game, implying that the game is running in the background.

Has anyone else faced this issue and what could be done about this?

FWIW, I am on EndeavourOS with the git version of Gamescope installed from the AUR, though the non-git version does not fare any better. GPU is AMD Radeon with Mesa.

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