I’ve discovered that the in-game cursor is flickery and keeps jumping to the upper left corner of my desktop (outside of the window!) for a few frames here and there. I had a hunch, so I dropped my refresh rate back down to 60FPS (from 120) and that fixed it.
so you have some display bugs at high refresh rates. Windows 11 Pro, Nvidia RTX 3090, Ryzen 8 5950X, 32GB RAM, native display resolution 5120x1440 (32:9 ultra-ultrawide monitor)