Thank you. I understand that if I change metadata then the opf will change. The point is that I don't think I did anything to change the metadata of these books. And it seems odd that 20 random books with no commonalities out of 10,000 would change.
I have done a diff against the backup to determine which files changed. But I am unclear on how to tell what changed within the opf.
Can you please provide a hint on how I can compare the content of opfs?
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