musescore / musescore/MuseScore

Both instruments play if an instrument change is added to the first measure/bar

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P3 playback regression MS3
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Description

Issue type

General playback bug

Bug description

When adding an instrument change to the first measure, both instruments will play.

Steps to reproduce
  1. Create a score, add some notes to the first measure.
  2. Insert an instrument change in the first measure.
  3. Press play, both instruments will be playing.
Screenshots/Screen recordings

https://github.com/musescore/MuseScore/assets/69917893/5cbdb9ed-b918-4750-afc1-f49694b2c891

MuseScore Version

OS: macOS 11.6, Arch.: x86_64, MuseScore version (64-bit): 4.1.0-231530303, revision: github-musescore-musescore-5745a86

Regression

Yes, this used to work in MuseScore 3.x and now is broken

Operating system

OS: macOS 11.6

Additional context

No response

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Assessment

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