AppImages are too large with 200% scaling on 1080p, and cannot be resized or maximized

Distribution

CachyOS

Package version

Cinnamon 6.4.10

Graphics hardware in use

Nvidia 5060ti

Frequency

Always

Bug description

I posted this issue here but I'm thinking this has to do more with cinnamon (https://github.com/menloresearch/jan/issues/6171)

AppImages start very large on my 200% Scaled Cinnamon X install on CachyOS. Maximizing the window is greyed out on cinnamon. This has happened with at least two AppImages that I have installed (Jan and Lunatask). The vertical and horizontal size of the window is fixed and I cannot adjust it to be equal to or smaller than my screen height - it's just locked. The only way to use these AppImages is either revert to 100% scaling or drag the window around using alt/win + drag, but part of the window is always off screen due to this.

I also tried launching the appimage with different settings given this similar issue (https://forum.lightburnsoftware.com/t/lightburn-appimage-on-ubuntu-22-04-too-tall-for-screen/137908/18) like this to no avail:
QT_AUTO_SCREEN_SCALE_FACTOR=0 QT_SCALE_FACTOR=1 ./appimage -geometry 1600x900
Changing the number even smaller like 800x600, or removing or tweaking flags does nothing, it seems like it's hardcoded somehow.

Steps to reproduce

Launch an AppImage on 200% scaling on a 1080p monitor (in my case Jan and Lunatask were tested). The Window size is fixed, cannot be resized, and will not respond to any environment variables or flags to adjust the size or scaling.

Expected behavior

I should be able to maximize the window properly or resize it as I would like instead of fixed vertical and horizontal window size. Barring that I should at least be able to use environment flags or AppImage flags to force the scaling to be otherwise.

Additional information

No response

No Cinnamon file, test, or entry point is identified. First reproduce the fixed-size AppImage window on Cinnamon with 200% scaling, then trace the window sizing and maximize handling. Done means identifying a Cinnamon-side cause or confirming the behavior belongs to the AppImage and documenting the result.