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In cases where the publisher changes something about the book, the older version can get 'orphaned' and is no longer listed on Amazon.
Thumbnails only get generated on-device when they're personal documents, otherwise it gets downloaded along with the book. But for some reason the thumbnail asset isn't part of this for 'orphaned' books.
If you go to your Content listing find one of the books without thumbnail and click on the title. If that doesn't open the book listing then it confirms the above hypothesis.
If it does open a page then cause lies elsewhere.
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