Quest - the \"science\" (bugs and problems) (Desolate)

The murder wanagi using a ranged weapon, but without entering the area of the dome and, respectively, the shift stage of the quest (wanoga can hear the overloaded player and come close to the door with the key card) with drops quest item. And it does not respawn unlike the other mobs, nor during the withdrawal to a sufficient distance, or when you exit the game. Need to find a way to get the quest item or switch the stage without resetting the progress.