Array diff get wrong result

[xqin]

Array diff get wrong result

left.json

[
  {
    "id": "AA"
  },
  {
    "id": "BB"
  },
  {
    "id": "CC",
    "relation": {
      "A": "11",
      "B": "22"
    }
  }
]

right.json

[
  {
    "id": "CC",
    "relation": {
      "B": "22"
    }
  }
]

---

If I swap the data on both sides, the results are as expected.