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YouTube videos on full screen was not the correct width until a week or two ago. Found a workaround to flip phone landscape 180° for it to be correct width. Now that issue is gone but height is a problem. Bottom 10-15% is cutoff on full screen mode.
Toggle webpage to Desktop site and back to Mobile site has worked a couple of times for me in getting the correct video size so full screen fits perfectly for height and width but this doesn't always fix. It usually doesn't work and videos remain cutoff at bottom. Phone is OnePlus 9T.

I had the same issue with it being cut off on the left side, same solution of rotating the other way in landscape.

Now I've got the same problem with them being cut off at the bottom. Posted a few days ago, no acknowledgement from the developers. /Shrug?