The Kobo store has serious problems with edition management. Every time the publisher updates the cover image, the book gets a new page URL (title-1, title-2, title-3), a new release date, and all the reviews and ratings get wiped out. It's ridiculous. If you bought a book that gets updated like this, you will initially have access to the old edition in your account, but you won't be able to visit the product page anymore. It wouldn't surprise me at all if the old one simply vanishes from "My Books" after some number of years.
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