Salon \"Dolls\" (Batman: Arkham Knight)

Found all the bodies, passed Professor Pyg, took him to the station. After solving Riddler's riddles and interrogating informants, a riddle appeared in the "Dolls" salon, I came and saw the poster and solved it. I leave the salon, look at the map, and the task icon appeared there, although everything was completed. Is this a bug or is there something else that needs to be done?