Flooded Cave Bottomless - can't progress

Hi, I hit upon the bottomless cave problem again. This time in Crestwood, during the main quest where I need to go and fix the big rift in the Flooded Cave. I can proceed to the third torch, but at the point where -I presume- a large underground hall is supposed to be I can see the stars above, there are no stairs down and I can see some blue squares underneath. I drop from there and just get ressurected without health on the ledge. Please help! 

(xbox one, game disk, 2 dlcs from store)

Edit: I have tried reloading, and also reloading after a hard reset, neither of these worked.