this is the 'original' footage in the demo. I can guess, that you spec/unspec or are toggeling show_others and the tee is disappearing for a split second.
Since the "multiview" got no players anymore to spectate, it will deactivate itself ([..] and switches back to spectating only one player, you said "single view"). I dont think that it has something to do with the zooming. This problem shouldnt appear when you watch it "live" and not in a demo right?(edited)