I spotted this weird thing. The corpses are just standing upright or floating in mid air.
https://steamcommunity.com/sharedfiles/filedetails/?id=439555530
I am also having this problem. It seems to be specific to map bm_c2a2b from the chapter ON A RAIL. Also, it doesn’t happen until loading a save on the map and only affects corpses that were already there before the save. It doesn’t seem to happen on the next map either.