I have the same issue and had to rollback. For me, wayland was lagged and could barely logout, meanwhile x11 would put my CPU to 30% for no reason and had bugs in the interface. I know i had some trouble installing the new update with mesa not getting the right packages and throwing errors.
Unstable is literally where they develop. I’ve caught bugs in the source by using it many times. If you want my bugs.kde.org history I can prove it. I’m no software developer, so it’s the best I can do.
Do you want to incentivise me to not report bugs? I’m not sure what you’re trying to achieve. If it’s merely a good faith warning to not get my hopes up, I’m thankful, but it’s unnecessary.