I have a problem in the same chapter, but ahead of the gate.
In the Science Building.
When i get there, the game kinda crashes and loads only part of the stage leaving some rooms in the AIR, and well, right after going to the 2nd floor the game has no more stage so i can't go ahead and its a Stop.
I though there was some kind of issue with some update, cose haven't played main story in a while (I only got back to it to make do the new "Grounded" dificulty wich by the way is not that much higher than "Survivor").
Need help on this too. I would gues Noughty Dog must release some update to the game so we can load the level completly.