...sometimes.
Just went to try and it worked.
But a lot of times, I will go to the YouTube at lunch and watch some videos. Well sometimes I click a video, it loads the next page, and according to the progress bar at the bottom of the black box where a video should be, it IS playing. But there is no video or audio. I can hit the play button and it turns to pause. Then hit it again to play and it does...except it doesn't.
Then I quit Safari and it works. Again. I just tried it before I posted and it worked fine. So it's not all the time. This is on a 2019 MBP running Monterrey.