YES YES YES! Thank you for the post, OP!
This wasn't an issue till about five days ago and it only occurs in the YouTube application! It's difficult to reproduce, but usually having a video running, opening the comments section then successively minimizing and maximizing the video (in Portrait mode) can trigger this error.
I suspect it has something to do with a change in refresh rate, since this particular change causes just that.
It's not annoying to the point I have considered turning the phone back, but it's mildly concerning especially since the first time it occurs, you're unsure whether it's a hardware or software issue.