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I have this problem as well. No where near the issue you have though. I have a few ebooks that for some reason don't show the cover as a thumbnail. And I have no idea why that is. Since I am the one that added those covers to the ebook using Sigil. And basically created the structure and the toc. Even ebooks that are in a series and and Sigil shows them with an identical structure. One will show the cover and one will not. Very odd. But its only a handful of ebooks out of a couple hundred.
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