Aeros 2.3.1 : 2x2 Undo Entire Track not Working

When I record a loop in 2x2, I can double-tap the track button to mute the track, and the label turns to “UNMUTE”. BUT, then when I hold the track button, the word “UNDO” flashes in place of “UNMUTE”, but the track does not clear. (That is, if I hit the UNMUTE button, the track starts playing again and the button label goes back to “OVERDUB”.

Is this a bug or am I doing something wrong?