[MU4 Issue] Crash when trying to create a new score based on a custom template with instruments changes

[metasekk]

Describe the bug MuseScore4 crashes when trying to create a new score based on a custom template containing at least one instrument change in it.

To Reproduce Steps to reproduce the behavior:

1. Create a new score
2. Set at least one mid-staff instrument change (with the Change Instrument text) on an arbitrary staff
3. Save the score in the Template directory of your Musescore4 working directory.
4. Try to create a new score based on it.
5. See Musescore4 crash.

Expected behavior The new score should be created without a crash, regardless of the content of the template.

Screenshots I provide a video of the crash.

Platform information

• OS: Windows 10 Version 22H2, 64 bits, x64-based processor
• Tested on: MuseScore Release version (64-bit): 4.0.0-223472200 with MuseSampler v.0.3.2

Additional context It does not appear to be a critical issue, but it seems worth knowing about.