Happened whilst playing the official Zeus mission in multiplayer. The spawn was set up in Nove Chalupy town.
Whenever the host / Zeus attempted to drag a downed body, it would teleport some 800 meters away onto a certain position in the fields (marked in the attached image). The location removed constant, and so it soon filled with corpses.

Additionally, under certain angles and/or zoom levels, these corpses would disappear, with only their equipment, headgear and shadow remaining:

Occassionaly they disappeared outright.