I got a strange issue. I tried to fulfil the "don´t convert anything"-quest and I did it!
I killed the boss without converting anything. Proud I tried to leave the instance, but I couldn´t. I was forced to take the boss trophy, but without any free slots left, I had to convert an item, thus failing the challenge
Why is that so? Can´t we just leave with the normal stairs? Why do they disappear?