not exactly sure what happened but there's a bug during this mission, When I started it and almost have the survivors got the the extraction, when the approached the door towards it they fall straight through the floor. I thought to myself maybe it's just a one time thing, and it happened again for the 6th time. I was only doing this mission so then I can 100% the star chart but now I can't do it because this mission will not allow me to complete it at all