Ah, that makes sense. Too bad. I have all my games on steam and haven't yet found a way to play them with the patch. I could, of course, compile proton with the patch myself, but somehow I am too stupid for that.

How did you get it to work within proton? Last time I looked, the Wayland patch wasn't yet included in proton. I'd love to use it for my games too.

This just can't be...

After some deep digging, I found one last Idea. Try launching steam with the -vgui flag and let me know if that works.

I am pretty sure that it has to do something specificially with the Steam Flatpak

That is also possible. But then why is it working for everyone else? I used the steam flatpak multiple times today with no issues. I guess you could also ask the same question for the system package issue theory.

How about the package manager version? Is that working? That could give some hints on whether it's the system or the Flatpak package.

Arch, yes. This is what all the people who had to remove xdg Desktop portal use. How could they remove it if it's a dependency of flatpak? Maybe they don't have flatpak.

If you have too much time on your hands, you could try another fresh arch installation on another hard-drive. If it works there, we know it has to be a system package. If it doesn't, it's probably the Flatpak.

Okay, well then we'll need to investigate further. 

On one page I found a set of rm commands for resetting Steam issues and adapted it to the Flatpak version.

While these commands will delete most of the steam stuff, just in case you didn't know, for any flatpak you can run flatpak uninstall --delete-data to delete all user data for uninstalled apps. Or, if you don't want to uninstall the app first, just deleting ~/.var/app/the app you want to delete the data of will also do the trick. That, just as a small side note.

Resetting it like this seems to work a bit. The Steam interface started up one time and after logging in and restarting it, it now does the same thing as before.

That's something at least. Why don't we try something? Maybe the beta version will fix it? When you have the steam client open, try switching to the beta version of it. You can do that by opening the steam settings, go to interface and select the beta. If that also doesn't work, try launching it with -no-cef-sandbox, as that also fixed it for some people.

Why so toxic? What is wrong with me saying that I probably won't be using it if it isn't open source? Why does that bother you? (Serious question)

Too bad, I guess I won't be using it then. But thanks anyway.

Will it be open source? Or is it already?