that's cause there are different ways of reading these numbers and the generator is not exhaustive.In this case, the generator uses on'yomi for the entire number, but to get vegetables (yasai) you'd need the kun'yomi reading of 8, which is やつ (sounds like yatsu), making it go from hanzai (crime) to yasai (vegetables).
I dunno what the rules for goroawase reading are exactly, though
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