I've never seen video compression or packet loss do that. That's just bizarre.
packet loss could absolutely act in this manner if using h264 or h265 compression. each successive frame between reference frames contains only the information of what has changed from a previous frame, and is not a complete picture.
if you're missing a packet that updated that part of the frame it could look just as it did here.
I'm not saying that it wasn't caused by some other phenomena, just pointing out that this is also A viable answer.
I've seen h264 video corruption many times and it's very obvious when it happens. The spot tends to drift slightly and there is fuzziness around it. I'm not saying it's not video corruption--I don't know--but if it is, it differs from the kind of corruption that I've ever seen.
It is unusual.
But suppose it is green screen, then what are we seeing. Is he stepping over the backing, or behind, or even on top of it?
occams razor on this one makes me lean towards some type of data error.
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