Ottava (8va/8vb) number is too big
Behind Bar's p.28 says:
> The numeral '8' is 1 1/2 stave-spaces high.
In MuseScore the numeral is about 2 stave spaces high, which is too large.
Workaround: Reducing the font size from 12pt to 10 pt seems to give the right size, but this should be done in the default style rather than left up to users to do on their own.