Big chunk of landscape disappeared.

[kociol21]

So I started new playthrough and I started in Hall of Vigilant. When I left the building I saw this:

http://imgur.com/a/D2FYu

I have big chunk of terrain missing. When I try to walk on it I fall through into the water beneath :O

Is there any way to check what mod causes this aside from manually disabling every single mod and rerunning the game?

I tried to do some research and I think it is probably HalloftheVigilantExterior01 or HalloftheVigilantExterior02 cell. Problem is, no mod is altering these cells. Wheels of Lull and Konahrik Atroucements do some minor changes to it, but the problem persist even after deactivating these mods.