When I was developing Baldi Rooms, I couldn't figure out why I cannot win after collecting 9 notebooks. But then I restarted and recollected a few notebooks to find out that I can escape. This is odd to me since I have added exits and coded the scripts so that you can escape after collecting a certain amount of notebooks, the thing is however, I have purposefully locked the game mode to endless, which meant that notebooks will respawn after a certain amount of time, I have done this for the gameplay to be more of a survive the time type, I believe this is where the bug occurred.
I don't know if Arts And Crafters is in Baldi Rooms but I am sure that 1st Prize is in it, I just think you didn't see him in your playthrough.
Also, even though this is the last update, I will look to remaster Baldi Rooms in Normal_Person2_0's Decompile Collection. In the remaster, I'll rework It's a bully's positions and think of a way to improve the usage of the yellow door lock. Thanks for your suggestion!