I don’t know what is wrong with this dungeon but a few of important things are not working
First of all, which was quite painful, I couldn’t open inventory. Either the pad and the keyboard shortcuts wasn’t working at all. So I had to use what I came with.
Second of all, there is a forgery which I was unable to use. It looked like I was trying to use a skill instead of opening the forgery. The second item in the same room (a book I guess) was working properly.
After finishing the quest and getting back to the world map inventory fixed itself.