I suspect this is all of the error log that matters:
WARNING: discarding _NET_WM_PID 52817 as invalid for X11 window - use specialized XCB_X11_TO_PID function!
I also have message like: WARNING: discarding _NET_WM_PID 5 as invalid for X11 window - use specialized XCB_X11_TO_PID function! but Steam and games works.
Game information: Steam
Distro: Fedora release 39 (Thirty Nine)
Flatpak info: flatpak --version: Flatpak 1.15.8 flatpak --gl-drivers: nvidia-550-78 default host -->
Problem description: logs.txt
I suspect this is all of the error log that matters: WARNING: discarding _NET_WM_PID 52817 as invalid for X11 window - use specialized XCB_X11_TO_PID function!
Does this issue reproduce with native Steam: based on this reddit post it does not happen on native
P.S https://github.com/flathub/com.valvesoftware.Steam/issues/1277 this is the same issue but badly formatted so I made this one with full logs.