BUG: Chords from full score play in a part without chords, even when "play part only" is selected

Set up a score with Great Stave, and place music on it.
Add chords symbols to the music.
Copy notes to separate SATB voice staves, but NO chords.
Create a "part" with just the SATB voices.

Play the SATB part with 'play part only' selected, and the piano chords from the main music plays alongside the voices.
If you delete the main chord symbols, and the SATB part plays only the voices as expected.

I have reduced down the example to a single bar which still exhibits the problem, and uploaded.
Switch to the SATB tab and play - you will hear the piano as well.
Go back to the main tab and delete the 'Am' chord symbol, switch back to SATB tab and only the voices are correctly played.

Any solution to this?