You can see the issue at https://en.wikipedia.org/wiki/Template:Did_you_know_nominations/2022_University_of_California_academic_workers%27_strike
This is also an interface problem, as shown on Special:Search:
On the DYK nom talk page @RoySmith explains:
... At the size it ends up on the front page, there's a big "CC" logo near the top, a play button in the middle, and a "0:14" legend naar the bottom. Between the three, you really can't recognize what it is.
TheDJ, Amir suggested I cc you on whether it makes sense to change this behavior for vertical videos or have some of the icons disappear when the video is small.
I note that on the article itself, https://en.wikipedia.org/w/index.php?title=2022_University_of_California_academic_workers%27_strike&oldid=1125096771, there's enough space so the player works fine.