After returning to Amsterdam Sewers, I found the entrance, but any attempt to use "Labyrinth's end" in a verb results in a message stating "I cannot do this, as some other task focuses my attention completely, or because this task requires my undivided attention". However, I have no other tasks running. In addition, for some reason only 3 out of 6 clues got removed on the final interaction with sewer labyrinth. Is there any way to progress the adventure?

Update: I tried leaving the adventure and returning. It worked, but the clue and bazaar reputation did not disappear even after I docked at another city. I had to use the console to despawn them.