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In my experience the most common cause of blank pages in Apple Books is an encryption.xml file left over from DRM removal — even if the file just contains an empty EncryptionData element, Apple Books sees it and refuses to render. Opening the epub as a zip and deleting META-INF/encryption.xml usually fixes it.
The other culprit I've seen is XHTML namespace issues. If the content files use the wrong namespace or are missing the xmlns declaration entirely, Apple Books silently fails while other readers are more forgiving.
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