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Looks to me like something might've gone wrong with the cover there. On the attached screenshots you can see books with and without a cover. (The sample PDF starts with a white page.)
Toggling ignore/unignore cover might work. Also if you can share a document with a failed cover perhaps we (or perhaps mainly @poire-z) can try to figure out what went wrong and try to fail better if it's due to a slightly borked document.
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