Reading your post, at first I got scared like “did it happen to me as well and I haven’t noticed it, is there someone in the recordings who shouldn´t be there in the screen?”
Then, I remembered that yesterday evening I forgot to replace the spotlight with the second panelist (don´t mind the word, it wasn’t webinar, just regular meeting).
So, while she was speaking the first panelist/speaker was on the screen.
It wasn’t much of a deal since the one in the screen was nodding and smiling while the other´s speaking, so the scene turned out to be nice, after all
I’m writing about this, because I, once more, can definitely confirm that it’s not a general issue.
That been said, maybe Zoom´s launching their updates region by region and the bug you´ve faced might be on its way towards us all