I played at monday with three teammates. I walked with one of them near mogilevka while one friend had some desync like 57000. I run away from his position and a copy of my char stands right behind him. (Invisible for me)
He attacks this copy with his fists and my graphics turned into black and white and i take some damage from his attacks. For me it had looked like he punches into the air.
We tried this bug for about three times and i always got some damage, when he was attacking my char copy.