I’ve bene quite happy with 12.3 so far since it appears to have fixed a really annoying Safari bug I’ve been suffering from when on wifi. <hope that didn’t just jinx it> 
However, it appears 12.3 has also broken Safari’s previous handling of website notifications. I have all those turned to ‘Deny’. But since I updated I’ve started getting Safari notifications whenever TidBITS Talk threads I’m following get new posts. Turns out, lots of websites now show up individually under Sys Prefs > Notifications (they were not there before) and they all need to be turned off again. Lots of unnecessary work. 
ot/ What’s with this unhealthy obsession these days with getting popups all the time to nag you about insignificances anyway? Do people not have enough work? No purpose? No hobbies? Or are notifications the new “hobby”? Yikes. 