This is known, they are working on it. I was stuck on this for hours but I found a workaround. You run the story as normal till u get to the spider tank. If you get into a server with no other players the quest will continue as normal. But if you don't get into an empty server, then chances are the other players are stuck on the exact same thing and your quest will never update. Unfortunately you have to get lucky but with enough persistence you can get past this part.