Opening the same score multiple times gives different results

7fe2bd3 Win10 Pro
This is some of the strangest behavior I have ever seen in a software application. It requires more than the normal number of steps to reproduce, but it's worth it if you can reproduce it. The two attached files are from these musescore issues:
https://musescore.org/en/node/122491
https://musescore.org/en/node/122471

Open the anon_romanza file. Leave it open.
Open the other attached file. Notice the number of pages and systems per page (this will vary)
Close the second file, then reopen it. How many pages and systems per page? For me it changes.
Close and open the second file again. Again the number of pages and systems per page is different, a third different layout.

I am seeing a variety of goofy behaviors with these two scores. It seems to cycle between 3 different layouts for both scores, depending on the order in which you open them. Too many variations to document here, but the cycle of 3 layouts seems to persist.

I really hope others can reproduce this, because it's baffling to me.