Crash after trying to add chord symbol to FBD and pressing Space (with opened part)

[DmitryArefiev]

Issue type

Crash or freeze

Description with steps to reproduce

1. Add Chord symbol with Fretboard diagram in Score
2. Open Part
3. In Score, delete Chord symbol
4. Select Fretboard diagram and press Ctr+K (If to click on empty space, Chord symbol doesn't appear. This bug also occurs in 4.6.0)
5. Press Space (This crash is new and doesn't occur in 4.6.3)

Supporting files, videos and screenshots

bandicam.2025-11-25.18-01-33-545.mp4

In which versions of MuseScore Studio is this issue present?

4.6.4-253290408 (4.7 as well)

Regression

Yes, this works in the latest released version and is broken in the nightly builds

Operating system

Windows 10

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