Sound flag silences playback after copied to another instrument

Issue type

General playback bug

Description with steps to reproduce

If you copy/paste a sound flag to an instrument that doesn't support that sound flag, the second instrument will produce no sound during playback. It's easy to do this without realizing it by copy/pasting a range.

Example:

1. Create a new score containing trombone and piano (using Muse Sounds for both)
2. Enter some music into the trombone part
3. Add a sound flag at the beginning of the trombone part and set it to "classic phrasing"
4. Copy and paste the entire trombone part into the piano part
5. Select the first measure of the piano part and press spacebar to start playback

Result: no sound
Expected result: piano part sounds normally

Supporting files, videos and screenshots

https://github.com/user-attachments/assets/0c544890-9919-4b3b-bb98-172eaa6dcdf4

In which versions of MuseScore Studio is this issue present?

4.6.5

Regression

No.

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