Variable Refresh Rate (VRR)/Adaptive Sync caused a weird bright ghosting when moving, especially near high-contrast edges. This is my KDE Window Rule for disabling VRR for Noita, which solved the issue for me: https://gist.github.com/laundmo/c8f50886b6815c1391495ed12f34aea4

It should not be needed if your monitor doesn't have VRR, or maybe just a better implementation than mine. It's also not needed for windowed mode at resolutions below the screen resolution.