Have you tried temporarily disabling the Compositor with Shift+Alt+F12? This fixed a lot of my graphical issues in games under Wayland with an Nvidia card.

You're correct, it's actually a KDE shortcut. My misunderstanding.

In my case it did help, so not a placebo. Given that OP is also using KDE, it may still help.

Ah, gotcha. I'm not new to Linux in general, but I'm very new to running it as a desktop (as in, the last few weeks). The last time I really tried was well before Wayland was even a thing. I've been distro hopping a lot to find what I like, and didn't even realize I wasn't using Wayland this time, oops. That certainly explains why it worked for me.

Learn something new every day. Thanks!