Linux Titlebar not working as intended (KDE Plasma 6 Wayland)

[code-leech]

There's a visual glitch where if I use maximumSize and minimumSize or even setResizable, I get the glitch in the photo.

I'm using KDE Plasma 6 + NVIDIA GTX 970.

I think the problem is the GPU, since glitches on KDE concerning the NVIDIA GPU are common.