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I don’t know if it works on SteamOS, but I use my deck in Windows very, very frequently due to using it as a main computer and I had a giant stack of years worth of code cards from the SUMO/XY era I never touched. I just used something called Camo to used my phone as a webcam and got through the stack pretty quickly.
I imagine there might be something similar for SteamOS, especially since you can use a phone as a mouse and keyboard with KDE Connection.
I do want to warn for the case of Genshin about Mihoyo banning people as the only way to get it working is with that one Anime Game Launcher that bypasses the anti-cheat.
The game still runs in SteamOS that way, and while I do know people often say it’s not often it happens or rarely gets reported of happening, it is still a risk and I remember seeing somebody having a breakdown because they lost a ton of progress in Star Rail after doing the same thing for it on the Steam Deck.
The safest option (what I do personally) is just using it on Windows. That said, hope you do find what the issue is for other non-steam games; certainly an odd problem!