Copy and Paste corrupting files

As many people have realized lately with Musescore 4, doing certain tasks such as copying and pasting large bodies of music will often crash the program entirely. To avoid this, I usually duplicate measures one or two at a time. This time, however, I was arranging Chopin's Ballade No. 1 for a marimba trio, and when pasting the treble line from measure 85 over to one of the marimba parts, the program crashed. After I restarted and got back to where I was, I tried copying bar 85 over again, but only the first half of the measure this time. When I did this, not only did the application crash, but the entire file read as corrupted and I have not been able to open it since. I even tried restoring a previous save of the file, but Musescore still claimed that the file was corrupted.

Below, I have linked the original piano file that I downloaded from Tristan Chin (@Jay-Len) in order to arrange my piece, along with the now corrupted file that is the marimba trio version. If anyone is tech-savvy enough to figure out how to open and/or restore the Marimba Duet file and share that info with me, that would be the best.