I was playing and was at the airport i was in the air tower walking down stairs. suddenly i get a black screen "you are dead". My friend told me he saw me jump of the building.
Further investigation also shows that sometimes can stand in front of zombie without him noticing you and after walking 50 m further he could suddenly start following you this once again confirms movement lag.
Even further testing i died again when i was in building but only this time it appeared the building disappeared when i pressed ESC so basicly i just clipped through the whole building i fell to dead.
Basically the server thinks you're at another location than you are seeing. But even stranger the desync symbol is not showing even once on my screen when this happens.