I swear for about 2-3 years this bug occurs where very intermittently the rounded corners of notifications will be sharp and rectangular. It also occurs on my iPad. I’ve transferred phones, started from scratch, and none of it fixes it. I’ve also reported to Apple feedback for the same amount of time.
I’m attaching a screenshot of the location of what I mean, but I think that crazier than the bug, it’s the fact I’ve been trying to screenshot this bug for that length of time and I’ve literally never been able to 😭 🤣 it just happens too fast.