Here's a fun bug that started with iOS 15. I have my phone set to automatically switch between light/dark mode with sunrise/sunset.

In light mode, the Safari URL bar is supposed to use black text on a light grey background:

https://ibb.co/vQGy1r7

In dark mode, the Safari URL bar is supposed to use white text on a dark grey background:

https://ibb.co/87x119J

Except, when my phone switches automatically to dark mode, the text color switches but not the background. So I get white text on a light grey background which is illegible:

https://ibb.co/dJHT467

The only fix I've found is to force-kill Safari. But then at sunrise, I get the opposite problem: black text on a dark grey background, and I have to force-kill Safari again.

I've been force-killing Safari twice a day on my phone since iOS 15 came out. :-(

Manually toggling light/dark mode does not exhibit the problem, nor does it fix the problem when it's in this state.

I have some possibly non-default accessibility settings: reduce motion on, button shapes on, on/off labels on, increase contrast on. Also in Safari: single tab, landscape tab bar off, allow website tinting off.