Steps to reproduce:
1. Place noteblock
2. Place redstone toch next to noteblock. Noteblock plays. Work as intended.
3. Place stone next to noteblock causing noteblock to update. Nothing plays, work as intended.
4. Close world. Open World.
5. Place stone next to noteblock causing noteblock to update. Noteblock plays. Bug!!!
(Remember that over noteblock must be air always, so don't place on noteblock anything.)

Bug causes some mechanics to doesn't work as intended. Example in attachment. Normally rotating arrow in frame should play gama. After reloading world, multiple noteblock plays on one rightclick of item in frame.