"Follow Chord Track" plays whole chord, not just the selected single voice

I first create a chord track. I then create an instrument track (with a HALion instrument, an electric piano). Under the Inspector of that instrument track I select Chords > Single Voice > Bass. The Voicings are set to “Piano”.

PROBLEM: the instrument track plays the whole chords, not just the bass note. Same if I select another voice (soprano, alt, tenor etc.). Selecting “Root Notes” instead of “Single Voice” doesn’t have any effect either. The whole chord is still being played.

Mute the chord track or select some other channel for chord playback.