"Broken" lines for tablature fret marks no longer working in Continuous view mode

Issue type

Engraving bug (incorrect score rendering)

Description with steps to reproduce

1. Right-click tablature staff and select "Staff/Part properties...".
2. Go to "Advanced style properties..."
3. In the "Fret marks" pane, select "Lines are: Broken".
4. Observe that lines are not broken. Appearance is the same as "Continuous". This is apparent both in the preview and the actual score, after saving the setting.

Supporting files, videos and screenshots

In which versions of MuseScore Studio is this issue present?

4.7.0-260513133, revision: github-musescore-musescore-9989a50

Regression

Yes, this used to work in a previous version of MuseScore (4.6.x)

Broken no later than 4.7.0-260403044, revision: github-musescore-musescore-261ed26 (the earliest 4.7 nightly available)

Operating system

Windows 11

Additional context

Also broken in latest nightly build, 260516050-4.7-28f5d2a

Checklist

• This report follows the guidelines for reporting bugs and issues
• I have verified that this issue has not been logged before, by searching the issue tracker for similar issues
• I have attached all requested files and information to this report
• I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible