Can you provide a code example project that can reproduce the problem? I am facing the same problem, but apple is not responding to this issue.
iAladdin
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I have fixed issue 2.
I use using MediaItem's artworkImageURL property in my code, but tvOS 14 not support artworkImageURL(I don't find any documents about this, maybe it is a bug on tvOS 14). After I comment this line, everything work.
					 const mediaItem = new MediaItem();
// mediaItem.artworkImageURL = v_pic;
mediaItem.description = v_description;
mediaItem.subtitle = v_subtitle;
mediaItem.url = v_url;
mediaItem.type = 'video';
mediaItem.title = v_title;
mediaItemList.push(mediaItem);