First - post upvoted because of the detailled report. Helpful. Thanks!
I’ve had the same problem a longer while ago.
Do you really have this few games in your library? I haven’t used the normal Steam mode for a while, but on your game list is a small Penguin. I believe that’s due to the filter “show Linux native only”.
If you forgot to activate Proton, go into the Steam settings, gameplay and hit the checkbox “Compatibility for other games”. Use that all the time, even for Linux native games. They are usually way buggier than the Windows version, and Proton works great today.
Second, if you are already using Proton and my first guess is wrong, use another Proton version. Either the most recent one (proton-experimental), an older one or the “proton-GE” versions.
What distro are you using?
Did you try using Flatpak instead of the native package? Maybe, there’s something missing in the native app.
Oh, and I also wouldn’t worry much about the firmware errors and such. This panel is very new and some things are basically impossible to archive. But don’t trust my statement, maybe I’m wrong.