SUMMARY
essentially, every time i alt tab into another window, the window extends downwards by a couple of pixels, which gradually obfuscates a good chunk of the bottom of the window after several alt tabs. clicking restore and then maximize returns the window to it's original size, but it remains prone to extending. this seems to be only maximized apps, not on windowed apps. also, only some apps, such as discord (i use equibop from flathub) and strawberry music player (from official fedora repos).

STEPS TO REPRODUCE
1. Installed Fedora KDE Plasma Desktop
2. Installed some customization things such as Darkly and Klassy, as well as themes, but nothing too major
3. I dabbled in using the Rawhide kernel and have since reverted to 42's kernel; broken packages may remain, but I have doubts

OBSERVED RESULT
Alt-Tabbing to switch to certain windows extends the window from the bottom off the bottom end of the screen when maximized, not to the sides or the top.

EXPECTED RESULT
The window should remain the same size and fit the screen perfectly.

SOFTWARE/OS VERSIONS
Linux: Fedora KDE Plasma Desktop 42 
KDE Plasma Version: 6.4.0
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1

ADDITIONAL INFORMATION
I use an AMD 7800XT, integrated graphics are disabled, if that's at all important. I also noticed the same thing happens when full-screening videos in Discord and exiting fullscreen.