I think the video is supposed to load. "More from this gallery" is, as it suggests, other items in the same gallery (not sub-galleries). I'll investigate.
I cannot reproduce on my end. The video loads as expected (if you're expecting it to auto-play, it's not supposed to do that; browsers forbid that from happening without a user interaction first).
Please confirm if this issue still exists for you on 11 beta4.
Please confirm if this issue still exists for you on 11 beta4.