Confirmed and tested. For an easy test (if the countdown fails) have a character watch you load in. When body appears tell other user to spam escape. This will leave their body in game. Their gear can be looted after false character is handcuffed or killed. Character animation for false character is prone then crouch and remain crouched.

Have personally seen the bodies left behind from this action on multiple servers (issue is widespread). You should be able to tell fairly quickly/easily when a new spawn has been killed or when a character has been duplicated.

I would call this a critical bug and would like to see this resolved in an upcoming patch. Would also like subjects on duplication moved to a private or hidden section of the feedback forum for developers to address so this technique cannot be broadcasted for everyone to see and use.