Staff type changes are hidden during multimeasure rests

Issue type

UX/Interaction bug (incorrect behaviour)

Description with steps to reproduce

Staff type changes are hidden during MMRests. This can be problematic in parts, where a hidden staff type change may be causing (seemingly) unexplainable issues.

https://github.com/user-attachments/assets/0d4afbaa-dc2f-476f-9189-60df51223dab

Supporting files, videos and screenshots

Also, staff type changes do not break MMRests, which I think is debatable. In any case, staff type changes during an MMRest are unstable; in this example, observe that the music following the staff type changes is drawn on a 1-line staff with MMRests off, but a 3-line staff with MMRests on.

https://github.com/user-attachments/assets/b65fc877-05bd-484c-aeaf-972dd902e0ab

In which versions of MuseScore Studio is this issue present?

latest nightlies

Regression

No.

Operating system

macOS 26.6.2

Additional context

No response

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

Start with the attached minimal examples and compare the notation with multimeasure rests enabled and disabled, focusing on staff type changes and the following music. No source file, test, or entry point is named in the report; done means staff type changes remain visible and the affected music uses the correct staff type in both modes.