[MU4 Issue] Slurs not showing in part when splitting two voices

[henkdegroot]

Describe the bug Slurs which are added in voice 2 (or 3 or 4) in the main score do not appear in the part when the part only shows voice 2/3/4.

To Reproduce Steps to reproduce the behavior:

1. Create a new score with trumpet
2. Add some notes in voice 1 and add some ties and slurs
3. Add some notes in voice 2 and add some ties and slurs
4. Click the Parts button
5. Add a new part, name the parts Trumpet 1 and Trumpet 2
6. In Trumpet 1 part, hide voice 2 for the staff
7. In Trumpet 2 part, enabled the trumpet instrument and hide voice 1 for the staff
8. See the error

Expected behavior Slurs should remain visible when they are part of the voice 2/3/4.

Screenshots Main Score:

Part 1 - with only Voice 1 enabled:

Part 2 - with only Voice 2 enabled:

Platform information

• OS: Windows 11
• MuseScore: 4.0.1 (issue also appears in 4.0)

**Muse Score file (not the same file as used to create the screenshots) voice-test.zip