Unable to advance playthrough, Act 1 Manor Ramparts Entrance Missing

After defeating the Executioner boss and talking to the NPC, I left back to finish clearing area before advancing the quest and entering the Manor Rampart instance. During the clearing of the area, I left to town several times to sell loot and talk to NPCs and died at least once in the village. Upon returning to the where the Manor Ramparts entrance should be, there is an empty stairway, no boss fight, and no way to progress the story.

I have the same issue