ACardiganAndAFrown - sorry I didn't see this updated post; anyway, we're planning to integrate Hanazono into our big update (no longer using the stroke order data as a fallback font as we do now, since it only goes up to Extension B and it would cost us a lot of money to get the Extension C / D stuff), so it should render correctly then.
feng - did you install both files? HanaMinB is the one with the really rare stuff. (can't have more than 64k characters in a font file, which is why they had to split it)