Online Scores Not Saving, Resulting in Significant Loss of Progress

Multiple times over the past few weeks, I've saved a score online (and had the unsaved asterisk go away and no warning window about unsaved work pop up when I close the program). When I next open the score from my start centre, it has reverted back to an old version with no sign of any of the changes I made. This happened several times after taking notes on the scores while receiving guidance, but most recently I worked on a piece for at least an hour and lost all of my progress. It may be relevant that I often wait for the 'exporting audio' window to come up, then hit cancel and close the program; I haven't noticed any correlation between success in saving and letting the audio upload, but maybe that makes a difference. How can I prevent this from happening in the future, and is there any way to retrieve the new version of my score?
The score I'm most concerned about is linked below. As far as I can tell, there is no version of it saved on my computer, so I can't attach a file.
https://musescore.com/user/13308326/scores/12260515/s/0u-roo?share=copy…
The new version is drastically different, and I would really like to not have to recreate it from scratch. Thanks!

Edit: I went through my cloud_scores file in appdata and found only the old version of the score, and none of the scores that I took notes on. The file I did find there, which is the same as what's currently accessible online, is attached.