I don't know if this is unique to headphones, but this is how I discovered the bug.
Pre-requisite: My volume settings were 100/100/70/70 (don't know if these actually matter). Also, I was in the middle of editing a dungeon.
Steps to reproduce:
- Enter maker mode, if not already.
- Open the audio settings, and reduce master volume to 0.
- Exit pause menu.
- Disconnect and reconnect headphones (I have wired headphones; don't know if unpairing/pairing Bluetooth headphones will also cause this, for example).
- Enter play mode. Sounds are suddenly playing.
- Exit dungeon. Music is suddenly playing.
This effect persists, until the master volume is adjusted again.