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Interesting. The heuristic option causing the problem is "Ensure scene breaks are consistently formatted" (from the manual -- "With this option calibre will attempt to detect common scene-break markers and ensure that they are center aligned. ‘Soft’ scene break markers, i.e. scene breaks only defined by extra white space, are styled to ensure that they will not be displayed in conjunction with page breaks."). If I turn that option off, the AZW3 converts fine. With it on, regardless of the other options, it doesn't convert.
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