Well, I have tested myself and it is not so robust. Whenever there is a paragraph that ends just before the end of the page and the next paragraph is already in the next page, there is no rendering information available.
As per your question. I am working with media overlays (read aloud ebooks) which in Ibooks are only supported when the epub is in fixed-layout format. I hope that Apple will change at some point, but for now I need to abide to this.
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