Load Error: Critically corrupted file cannot be processed

After MuseScore crashed during editing, trying to open the file outputs the Load Error notification:

File "C:/Users/username/Documents/MuseScore3/Scores/filename.mscz" is critically corrupted and cannot be processed.

Details provided are:

MSCX error at line 2219: invalid measure length: -6/8

Whenever I encountered the same issue previously, this fix worked:
https://musescore.org/en/node/54721

Unfortunately, this time around the score doesn't open at all so it can't be applied.
So the repair assistant plugin doesn't work either:
https://musescore.org/en/project/repair-assistant

I tried an autosave recovery but could only restore the version from the beginning of the session
https://musescore.org/en/node/52116

Not trying to politicize, but is there any hope to somehow undo the corruption or is the only way to start from scratch again?

I had hoped someone would know a way to edit out the critical bar lines without having to open the file in MuseScore - maybe in a text editor?

Many thanks for taking the time! I would be thrilled if you know a workaround :D

Cheers, Jan