Repeat play count text duplicated on undo/redo; crash on toggle style after duplicating in 3.5.2 score with excerpts (?)

[cbjeukendrup]

Issue type

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Description with steps to reproduce

1. Add repeat barline
2. Increase repeat play count
3. Undo
4. Redo -> duplicated

If this was in a 3.5.2 score with excerpts:
5. Toggle repeat play count text in Style -> crash

Supporting files, videos and screenshots

Schermopname.2025-10-31.om.02.57.27.mov

With crash:

Schermopname.2025-10-31.om.03.58.34.mov

In which versions of MuseScore Studio is this issue present?

4.6.3, master

Regression

No.

Operating system

* / macOS

Additional context

These Sentry tickets must be related:
https://sentry.musescore.com/organizations/sentry/issues/297/
https://sentry.musescore.com/organizations/sentry/issues/12473/
https://sentry.musescore.com/organizations/sentry/issues/12505/
(the timing corresponds with my reproductions, and I don't think that many people are on macOS 26.1 beta)

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