Heyo,
So if you move a soldier over a dead alien or cleaner and try to take it's gun or move the body into your back pack you cannot, it also then causes a crash. Should be repeatable. Same works for your dead squaddies too I think, but that was a different instance and i haven't had it recur (have not purposefully tried to test but i'd believe its the same)
auto_groundcombat_turn_4_start-56.json