Score corrupted, and becomes re-corrupted after fixing, saving and re-opening

Describe the bug
Opening this score, saved by MU 4, will result in an invalid score.
You can ignore the loading errors, but you cannot overwrite them .

Even the guides did not work:

• https://musescore.org/en/node/341420
• https://musescore.org/en/node/54721

Especially saving will not save actual corrected data. The file will be as corrupt as before.

So what actually happened:

• MS4 crashed (probably while saving)
• The backup is also corrupted
• Bars missing, barlines missing, notes missing, notes replaced by whole-bar-rests, upbeats missing and/or merged into the next bar without a time signature change, etc.
• lots more

To Reproduce

Steps to reproduce the behavior:

1. Open the provided file
2. Click ignore
3. Edit anything
4. Save
5. Repeat

Expected behavior

• Do not save invalid files, not even on crashes.
• Have a non-corrupted backup
• Offer a non-corrupted backup
• Actually save the corrections I did.

Screenshots

as well as

(editing the file and saving does not fix the corruption).

Platform information

• OS: [e.g. macOS, Windows, Linux]

$ uname -a
Linux wells 6.1.12-1-MANJARO #1 SMP PREEMPT_DYNAMIC Tue Feb 14 21:59:10 UTC 2023 x86_64 GNU/Linux

OS: Manjaro Linux, Arch.: x86_64, MuseScore version (64-bit): 4.0.1-, revision: github-musescore-musescore-7ef0732

Additional context

Choräle für Blasorchester.tar.gz