Barline temporarily appears at top of page after enabling multi-measure rests

Issue type

Engraving bug (incorrect score rendering)

Description with steps to reproduce

1. Add a special barline (I use a repeat barline in the video, but it happens with others)
2. Select the barline
3. Enable multi-measure rests with cmnd+shft+M

rogue barline appears at top of page, disappears after next click

Supporting files, videos and screenshots

https://github.com/user-attachments/assets/9b9381da-2d4f-482e-8ab4-fbc35c1105da

What is the latest version of MuseScore Studio where this issue is present?

OS: macOS Sequoia (15.5), Arch.: arm64, MuseScore Studio version (64-bit): 4.6.0-252180330, revision: github-musescore-musescore-15406c3

Regression

No.

Operating system

MacOS 15

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

Reproduce the issue in MuseScore Studio on macOS by adding and selecting a special barline, then enabling multi-measure rests with Cmd+Shift+M. Done means no rogue barline appears at the top of the page during this action, including with repeat barlines and other special barlines.