Non-player characters from Fallout 76, which appeared with the Wastelanders update, began looting the corpses of players. This has already been seen before in the projects of the series.
Source: Uniongames.net
According to PC Gamer, this was encountered by users during the passage of tasks Riding Shotgun and Radiation Rumble. When a player is killed, NPCs run to his corpse and steal equipment, including ammunition and weapons. This way users will forever lose what they had, because non-player characters can't be killed or stolen.
Bethesda Game Studios has already confirmed that this is a bug. The team is working on fixing it.