I actually stopped having problems with steam on Wayland quite some time ago. But, one of the first things I did was turn off scaling (I have 1080 and 1440 screens). There used to be random issues with the menus in steam, and that went away a few months ago.

My only problems (as an NVidia user) with KDE plasma on wayland right now is occasionally discord will just freeze and I need to minimize/maximise to bring it to life. And very very rarely (and actually it might have been fixed, I've not seen it in weeks), one screen will entirely freeze and I have to either switch to a console and back or logout/login to bring it back to life. Oh and not a bug, but the OBS issue with global hotkeys. Now I can run it in X mode, but then it will randomly cause an issue where it makes games shudder. Only in X capture mode. It's most odd.

It brings enough positives compared to X that these really minor problems are worth it.