I noticed when doing additional troubleshooting, the error block shown on Plasma X11 on SteamOS are also appearing for Plasma Wayland. I am not sure exactly then what is causing these issues, as Plasma X11 does eventuall...
I tested the Wayland backend with a build of the unofficial Proton-tkg based from Wine Master (proton_tkg_9.10.r0.g12bbb07c). It indeed started with Wayland (denoted by the alterantive window decorations and incorrect fr...
I tried in Steam Deck Desktop Mode (the only X11 session I have access to atm), and I was able to get the game to work. If the game opens fullscreen, or if it opens windowed and is then fullscreened, the following log li...
Out of interest, I spot-checked a bunch of Proton versions, clearing the prefix each time, to see how older Proton versions worked in particular to see how versions before https://github.com/ValveSoftware/wine/commit/bd8...
From inspecting the blame, it seems the code logging this error, and its surrounding code, was introduced in ValveSoftware/wine@bd8ec8f264b5403f90bca6ecb26ae3170995ccd4 ([relevant log line](https://github.com/ValveSoftwa...