On multiple occasions, after killing another player that has a weapon drawn in their hands, that gun is not able to be looted. Upon killing them and going to loot the body, the gun in the person's hands stays in their hand and is unable to be picked up or looted. Cutting up the body in hopes that the gun drops to the vicinity causes the gun to disappear completely.
Unfortunately, I did not record this issue happening to show proof but it has happened twice now.