In my opinion they try to do too much in the UI. It tries to be too clever. Like switching colors based on background etc

Here first there’s a light tab bar and a light gradient behind it.

I scroll a bit and then the bar is still light but now with a dak gradient behind.

Scroll a few pixels more and now the bar is dark too.

All this happens between a handful of pixels.

And sometimes it doesn’t really work or glitches. It’s just too much „magic“ logic behind this stuff.