The OG OneShot Linux port is known to be extremely broken since it was really poorly developed. Even after applying a fix to get it to boot, it relies on old standards to do things like changing your wallpaper, so those features often won't work.
I'd highly suggest getting OneShot Wold Machine Edition which a remake/remaster of the original which takes place in a fake PC with a fake desktop that allows all those features to work in an isolated environment. Doesn't have a native Linux version, but the dev explicitly tested on Proton to make sure everything worked properly(specifically for the Steam Deck, but same difference).