I get a small square not refreshing under the cursor sometimes on Manjaro KDE Linux (Plasma 5.20.4) and Kernel 5.10.2-2 with NVIDIA non free driver 455.45.01.
Arch wiki seemed to suggest this might be related to hardware acceleration on GTK apps and it could be disabled. I did not test and gave up on this experiment for now.
I get a small square not refreshing under the cursor sometimes on Manjaro KDE Linux (Plasma 5.20.4) and Kernel 5.10.2-2 with NVIDIA non free driver 455.45.01.
Arch wiki seemed to suggest this might be related to hardware acceleration on GTK apps and it could be disabled. I did not test and gave up on this experiment for now.