Bell turns into double_wall state when updated with a noteblock

The bug

While placing a bell upon a noteblock, within its single_wall state, if you were to right click the noteblock/update it, the bell turns into its double_wall state.

How to reproduce

1. Place a noteblock, place a bell next to it so it connects
2. Hit the noteblock
   → Attachment type changes from single_wall to double_wall