I don't have it in me to write a bug report or know if it's chromium or wayland, however, if you want to:
I'm running manjaro, with kde, with wayland
I had planetside2 crash under proton
now every chromium-based window that is on the monitor I was playing planetside on, has the planetside software cursor and is unclickable.
until I move it to a different monitor.
but when I move it back, the soft cursor problem is still there
it only effects chrome windows, electron windows, and steam
and steam is built on chromium.
update:
if I move where my monitor is in virtual space (to the left/right/top) of my other monitor in the monitor editor, it fixes it, until I move it back to that virtual position