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For what it's worth, I prefer using the output of the KindleUnpack plugin instead of using calibre's convert ebook when converting azw3/KF8 to epub. If nothing else, KindleUnpack will do much less modification on the output file and comes a lot closer to duplicating the input epub (quite a few books are supplied to Amazon in epub format). I saw too many issues with calibre's convert ebook which does not remove epub3 bits and bobs when converting to epub2 and gets very enthused about splitting files (take a look at the footnotes files in the KindleUnpack version compared to the calibre conversion version).
I tried opening your scrambled azw3 with calibre's editor and it came up with multiple errors when I ran the editor's built-in check.
Also, it took ~3 seconds to convert your scrambled azw3 on my system.
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