This is NOT a problem with Newsblur but a YouTube change, posting here for info incase other people search for it.
This is not a problem as I came to report with embeded YouTube videos (whether from a site or a youtube feed) but then when I was doing some reading it is actually new change to the YouTube embedded player. See: https://www.androidauthority.com/youtube-embed-player-redesign-3652875/
I don’t use the mini player and just play videos in the feed (so it keeps my focus) vs clicking and opening in a new tab. I then sometimes press > (to increase the speed) or C for captions (if the video isn’t in English), and I’m sure other things like quality are now moved to the Gear icon at top right vs at the bottom, and (some) keyboard controls don’t work anymore. Can’t do that now with the new embedded player. Guess I’m gonna now be clicking and opening tabs.
As I said this is NOT a problem with Newsblur but a YouTube change.