Issue is pretty simple, YouTube videos embedded with the youtube tag cannot be put into fullscreen mode.
This seems to be caused by a typo in the iframe url. Changing "allowfullscreen" to "allowFullScreen" using Inspect Element causes the fullscreen view to start working again.
Sounds like your browser is weird, because the lowercase form is what's present in specs.

Never mind, I misunderstood. Setting autoplay=0 and allowfullscreen in embed URL parameters isn't a documented thing anyway AFAICT, so I've removed the URL parameters and everything is nicer.
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