I've had similar observations with different behaviors in Safari and Finder. One would think the quality of Apple's software would be increasing with the usage of Swift over Objective-C, but the opposite seems to be true.
There are like a half-dozen blatant bugs I encounter between daily and weekly in Safari. Text input and textarea editing is buggy in a couple ways, Apple Pay has a positioning bug where sometimes its bottom button is about 1/3 off the screen, certain elements on a couple pages smear when I scroll (but only sometimes). Not even counting ways the keyboard itself is worse now.
I haven’t seen browsing this buggy outside weird niche Linux browsers in… 15+ years?
Spotlight is also slow and buggy now, on an M3 Pro no less. I loathe the feeling of being faster than my computer and having to wait for it to catch up, something that I haven't felt since the M1 came out.