Chord Symbol offset keeps resetting to zero

For a Chord symbol attached to a Fretboard diagram, its Offset setting is lost after Saving and Re-opening the score. Steps to reproduce:

1. Start a new score, single staff.
2. Add a Fretboard diagram to the final rest.
3. Turn 'Automatic placement' off for both the Diagram and its Chord symbol.
4. Drag the diagram below the final system.
5. Expand the Diagram to Scale = 1.60.
6. For the Chord symbol, use the Inspector to set Offset Y = -2.00sp.
7. Looks good (see first image attached), so Save the file.
8. Close the file and re-open it (File > Open Recent).

The Chord symbol has moved (see second image attached).
Note that the Inspector now shows the Chord symbol's Offset Y = 0.00sp.