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Calibre stores a copy of the cover in it's book folder, and that file is always called "cover.jpg".
If you run Polish on a book with the box checked to update the cover, it will copy that external file into the book, and you will have a "cover.jpg" in the book file. Ditto if you convert the book.
If you manually rename the cover image using the editor, and save the book, the old filename should be gone. So what are you doing then? At what point or with what action does Calibre revert to the original filename?
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