When starting break, choosing music="silence" doesn't work

When starting a break, choosing one of the music options switching the currently playing music to the chosen channel, then returns to the previous channel when the break ends. This is how it should work.

Choosing “silence”, however, has no effect… the currently playing channel continues to play. It should start a period of silence during the break and return to the previous channel once the break ends, just like choosing one of the other channels does.