I highly recommend installing an extension that hides the home feed and sidebar recommendations, which at least makes YT non-distracting again.
Pausing a Youtube video overlays the video with a row of more video recommendations.
So if I'm pausing the video to see something in the video, video thumbnails are in the way.
This happens in the Roku app and sometimes in the desktop browser, but for some reason I couldn't trigger it when I tested it just now. Maybe one of my extensions blocks it.