"Insert special characters" does not work for dynamics

Issue type

UX/Interaction bug (incorrect behaviour)

Description with steps to reproduce

Recently, I had the need to add a "Brace" character in front of the dynamic to indicate that the dynamic is assigned to two staves between. But I couldn't do it.

1. Add dynamics
2. Double-click on the dynamic with the left mouse button
3. Open the Properties and click on "Insert special characters"
4. Select/press any character

Expected behaviour

It was expected that the selected symbol would be displayed next to the dynamic, but this did not happen. None of the special characters can be added to the dynamic.

Supporting files, videos and screenshots

https://github.com/user-attachments/assets/926b7dc4-8c3d-46cf-bf1a-7659a0ac4817

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

4.4.2-242550503, revision: github-musescore-musescore-6eab7b6

Regression

I was unable to check

Operating system

Windows 11

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