Jazz chord symbols: untick "Size follows staff space setting" affects vertical alignment

1. Set chord symbol "Appearance" to "Jazz". Add "CM7" and "F9#5" (say) to the score;
2. Now, select "Text Style" > "Chord Symbol" and untick the box labelled "Size follows 'staff space' setting."

Expected result: No change or just a change in size.

Actual result: Vertical alignment of first number in chord symbol also changes.