I just got a AMD RX6600 because I was having issues with my old gtx 1660 super. It’s not a big upgrade but I got this card for $120 (and it was only lightly used for 5 months by the seller).
I wanted to give wayland a try and It was working fine for a few hours but now, the screen blacks out every time I open or close an application.
I have tried restarting, logging out and logging back in. Also updated the system, mesa packages etc. (This is on a fresh install of Opensuse Tumbleweed, but I also had the same issue on my Artix install with xfce)
Strangely enough, the issue doesn’t seem to affect my Hyprland session much. Now it’s also coming in my Hyprland session.
The GPU works fine on Windows too. No black screen there.
EDIT: I fixed it. I enabled the packman repo at some point, which had slightly older packages and that caused the problem. Everything got sorted out once I deprioritized the packman repo and updated the system.
Are you on the open source drivers or in the official ones? You should be using the open source as they are better in this case.
I have the impression it has to do with your monitor as well, could it be some HDR functionality? Try opening the OSD of your monitor and check if something changes when on the application
Also check the AMDGPU archwiki, there are some troubleshooting suggestions you might want to look at.