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I haven't compared carefully but one that worked fine, the nav landmarks section contained from what I recall all files except the xhtml toc.
To be clear, all books, many hundreds, previously added before iOS 16 they also stopped working, at least the ones I've tested. Maybe there is something now unique to iOS/iPadOS, or maybe it's a bug, and maybe there's some clue or spec in the Apple Books Asset Guide, something that makes commercial ebooks I've tested work fine since perhaps many are submitted to the Apple Store and have something different about them. Who knows, various testing and haven't figured it out. bug maybe, or if it's something particular to Apple Books in now how it works, and if it is something that Sigil doesn't add, if, then perhaps something could change to improve compatibility given that Apple Books is so common.
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