It is located in the Khuddakapatha and Sutta Nipata. I find this confusing.
Mettasutta is the same way. Khuddakapatha is basically a collection where they took some of the best bits for beginners to study and gathered them together in one place: but they didn’t remove them from the places in the canon they had settled into before KN finished forming.
If you go looking for key passages (or as in this case, entire suttas) that appear in more than one place in the canon, you’ll find them everywhere. I think the usual explanation given is that the entire canon was developed and finished in its current form a long time before any of it was written down, and doing it only through oral repetition and listening and group recitation tends to lead to duplication in this way.
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Yes, there are a few MN suttas that appear in other nikayas in their entirety. It’s a normal thing. Sometimes they can have slightly different names, e.g. MN145 Puṇṇovāda, SN35.88 Puṇṇa
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