Crash when opening/closing mixer quickly on big score, e.g. Symphony Orchestra template (Master, Windows)

[metasekk]

Issue type

Crash or freeze

Bug description

See the title

Steps to reproduce

2024-07-08.11-07-41.mp4

Screenshots/Screen recordings

No response

MuseScore Version

Tested on latest 4.4 master (cff770b)

Regression

Yes, this used to work in a previous version of MuseScore 4.x

Operating system

Win10 (22H2); RAM: 16Go; CPU: Intel Core i5-9300H

Additional context

Found when re-testing #23158 after #23495 (comment).
I couldn't reproduce it in 4.3 (watch the video above).

I hope it isn't a duplicate (I searched in the currently opened issues, but couldn't find one corresponding). Close to #9467 but without requiring playback. EDIT: I just discovered it was equivalent to #13903 which was closed last month.

[bkunda]

@DmitryArefiev pls check

[DmitryArefiev]

Can reproduce on my powerful Windows laptop with a big score, such as Symphony Orchestra or European Concert Band templates

1. It's much easier to get a crash in 4.4 Master than in 4.3.2
2. Occurs with MS Basic as well
3. Can't reproduce on macOS

bandicam.2024-08-01.16-27-47-951.mp4

logs.zip

@cbjeukendrup Maybe you can take a look? (The crash also occurs in build from #14790)