The Labs Below won't trigger [PC]

Encoutered a bug where I can't complete the Regrets of the Dread Wolf quest because I can't collect the last memory. When I first entered the Crossroads I slid down the slope and the cutscene for this quest triggered, but I felt like I wasn't ready for it and wanted different companions, so I reloaded to just before. Now when I try to go down there to finish this quest the cutscene won't trigger, Tarasahl isn't there and the door is closed and can't be interacted with. Trying to reload an even earlier save isn't really an option because I've played for 80 hours since then. The last patch did not fix this. I would hate to have to abandon my first playthrough so far in, it kinda puts me off playing the game altogether.