playback of transposing instruments with chords

I created a new score in MS4:
- enter a single note e.g. C
- add a chord, e.g. C major
Playback sounds as expected: C note with C chord (if playback of chords is enabled)

Now make the part transpose e.g. semitone up: right-click > part properties > transposition
Display of both note and chord symbol are changed as expected
The note is played back at the same pitch, but the chord is played back as if written for a non-transposing instrument.
When clicking "instrument pitch" the chord is played back correctly.