This is on PC, the Steam version of Batman: Arkham Knight.
I'm trying to solve the first Riddler's puzzle on Bleake Island, the solution to which is the Batgirl suit in the Clock tower as I understand. I've used the remote hacking device to open the closet.
I've opened the secret closet and I can see the Batgirl suit, but I don't know how to "solve" the riddle. I've tried going into Detective mode or zooming in, but the riddle isn't solved as shown in the video here.
I've tried exiting the game and restarting, and I've solved all the other main storylines