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Excellent! It was 1.4.2, installed and never upgraded by Calibre. I manually installed this version and voila!
It not only works, but it shows even better: the issue. The title and author match, but the UUID doesn't. I have no idea why, because the book was uploaded by Calibre. Anyway, it did ask for a confirmation, along with a thumbnail of the book cover and than imported it allright. Super! Now I can remove the book to make some more storage on the device.
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