So basically as the topic already states; I am able to enter the inner sanctum with the vista, the adventure, etc. without actually having progressed in the story. Initially I had no idea how to get in there, so I figured, I could jump down from ontop into the hole you see on the map. Which in the end actually worked, by glitching through unmapped terrain at the end.
Now firstly I don’t necessarily want to post a description on how to get there publicly (since it is pretty exploitable tbh) and secondly the method is pretty long winded and i have no idea on how to describe it, other than showing it directly. I can’t record a video, since my pc is too crappy… so what am I gonna do with this?
I mean, it’s not exactly gamebreaking since it took me about 3 hours of frustrating search for an entrance to the inner sanctum to actually figure it out by chance, so I doubt there will be many people managing to do the same, but it should be a bug after all so there is that.