Clicking notes in an instrument part causes playback to go forte and to ignore dynamic markings

Issue type

General playback bug

Description with steps to reproduce

NB I think it might be a MuseSounds-specific issue, however, when you select "MuseSounds Issue" on GitHub, it navigates you to a non-existent page on a different website, where you can't create a ticket.

Repro:

1. Create a multi-instrument score with various dynamic markings
2. Open one instrument's part (it's always reproducible when using any MuseSounds instrument)
3. Click randomly on musical notes there

Expected:

• Playback shouldn't be affected/changed in any way after that

Actual:

• Going forward, the part is always going to be played at fortissimo, ignoring all the dynamic markings (both in the specific part tab and in the main full score view)

Supporting files, videos and screenshots

part-dynamics.mscz.zip

https://github.com/user-attachments/assets/153851df-23b7-4e1f-aa73-bcec4d719089

In which versions of MuseScore Studio is this issue present?

4.7.4-260706075, revision: github-musescore-musescore-7688c00

Regression

Choose option...

Operating system

macOS Tahoe (26.5.2)

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