Bug report: Dock Town - Thread Market stairs blocked off.

It is not related to the dragon attack. This is the save I made on the original patch, and played through the game, saving Dock Town from the dragon.
I could freely move through this area before the patch hit, going up to the upper level, and into the arena where you fought the Venatori. And some of my friends were also having the same issue with their first saves, where they have already done the mission to free the Threads' leader before the patch, only to come back later, and see the stairs blocked off.