[HappMacDonald]

I think it's interpreting the command as "replace each fruit with a vegetable", and it might intuit "make the resulting vegetables unique from one another" but otherwise it's not trying to find the "most similar" vegetable to every fruit or anything like that.

[futurisold]

This is the correct view. Since the instruction was ambiguous, the LLM did its best to satisfy it -- and it did.