First off, do you read metadata from file name or from file content (see preferences->adding books)? (I just realized that I confused OPL with OPF, I was thinking about Calibre reading the metadata from the OPF.)
What I find somewhat confusing is that you get only the TOC inside the ZIP file (Calibre zips up anything it thinks belongs to a HTML book, so the ZIP file part is expected behaviour), does the mbp_toc.html point to entries inside book.html? If not, what does it point to?
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