The simplest way I found to fix this issue is with Sigil, following the steps described in
this blog (by one of the Sigil devs).
Quote:
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First open the EPUB with Sigil and make sure the cover is properly set. Right click on the image in the Book Browser and under Add Semantics choose Cover Image if it is not already checked. This will add the meta element defining the cover to the OPF. Save and quit Sigil. That’s it, your done. However, be sure you’re not using Sigil version 0.4.0. You need to be using 0.4.1 or greater.
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Note that this will only work with DRM free books. There are plenty of other threads dealing on how to remove DRM, if you're interested.