Android phone help please ! [View all]

I used to be able to play pic on pic YouTube videos on DU.
I would start the video, maximize it, then touch the round button at the bottom of the my phone screen and it would continue to play as a picture on picture. I could scroll other apps at the same time and listen to the video.
As of last week, it stopped working. Now it shuts off the video when I go through the same process. Anybody have any clue why or what I can do to get it back? As per chat gpt, I've checked the picture on picture selections in my settings and they're all on.

Any help would be greatly appreciated! Thank you