https://bugs.winehq.org/show_bug.cgi?id=53114
--- Comment #3 from ryu.ketsueki@outlook.com --- (In reply to Rafał Mużyło from comment #2)
...also, which window manager are you using ?
I tested with two WMs and the same thing happens on both. Twin and Kwin. But I'm not exactly sure if the WMs are causing this because it didn't happen before. I am used to have this set up of different virtual desktops and wine applications on one of them while I do stuff on the other one. While I did observe it happening with Proton, I assumed it was because Valve's own implementation of Wine got something wrong so I didn't care that much about it. It only started happening outside of Proton when I started using a new wineprefix. It's not generated by Lutris, PlayOnLinux, winetricks or anything. I just nuked the prefix and created a new one by launching winecfg once. I didn't do anything else with that prefix. The old prefix is gone, so I can't do comparison between them.