Score playback tempo changes after editing a score
Steps to reproduce:
1. Open the attached score (it is this score converted to 2.X and further to 3.X format with some minor edits).
2. Play it a bit, just to hear the tempo of playback.
3. Edit something in the measure 7 or later. For example, repitch some note or remove/add some elements.
4. Play the score again.
Expected results: nothing should change except for the edit that was done.
Actual results: MuseScore somehow decides to play the score 2 or 3 times faster.
5. Now edit something in the measures 1—6. Play the score.
Result: playback returns to its original tempo.
Saving the score also returns playback to the original tempo as well as editing the first six measures.
OS: Debian GNU/Linux 9 (stretch), Arch.: x86_64, MuseScore version (64-bit): 3.0.0, revision: 59594be