When I explored the ruined castle of Zub i found myself having a hard time entering the central tower. I tried pressing V key and glitched through the tower floor, but I finally made it up the stairs. I was then unable to pick any loot as it was spawning inside the floor or even under the rooftop. I could see those items attached to the ceiling.

It looks like the whole structure needs to be set a bit lower. {F29115}