Musescore 4 crashes when opening file AND it's backup

As it says in the title. I saved my score, Musescore crashed, presumably after still successfully saving the score. Now I try to open the file and Musescore crashes. There is no pop-up telling me that it's crashed, the application just closes.

There is a backup file and it has the same modification time as the main file originally had - though apparently one of the times I tried to open the score updated the modification time of the main file. Anyway, Musescore crashes in the exact same way when opening that backup. My other backups are pretty old, is there any way I could recover the score without losing huge amounts of progress? There are no autosave files, which is why I think the score was succesfully saved before the first crash. I am very desperate.

I tried opening the files with another computer as well - no luck.

Attached are the main file and the "recovered" backup.