Parrot Party Map Broken?

I was just playing the Purple Parrot Party Palace map in more detail than I did last time and I think I came across a problem. When I pressed the button for the firework show, disc 11 didn’t pop out. Usually it would (or at least the last time it did), but this time nothing came out. I looked at a walkthrough video on the map and it did show the disc showing up. I made a different world on the same map and it still happens. I don’t know if this is a bug or a glitch but I hope this gets fixed.