metronome 'mute' in the mixer is purely visual, but only the 'metronome' icon can toggle the mute
S4 - Minor
1) open mixer
2) try togging the mute button for the metronome on the mixer
3)try toggling the metronome icon on top and watch the mute turn on and off
I can reproduce this. The mute button in the mixer does not function, though all other metronome controls in the mixer panel work as expected.
Workaround: Set the metronome volume to -∞.