When I was working on the "We found a Rifle" quest, during the second part I found a bug that allowed me to pick up the 3 Khvostov parts from the same spot. All I did was leave the area and come back, and the part would let me pick it up again on PS4.
-
I had this happen as well and now I can't pick up the other parts for grimoire score.
-
+1 for this happening on Xbone as well. Just picked mine up in blast and refinery never had to go to the third place.