I found it when I was using the firefox plugin ePubReader to read my books. When I added the second book (and the third, fourth, fifth etc.) with a UUID of a book that was already in the catalog, it would delete the first book and replace it with the new one...thinking it was an updated version of the same book.
I haven't had that issue with the limited number of other readers I've tried, but it seems like it could cause a problem.
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