Even I'm seeing the same issue. But I have not used string in ID

    {
  "users": [
    {
      "id": 1,
      "name": "Sudhanshu",
      "age": 30,
      "email": "[email protected]"
    },
    {
      "id": 2,
      "name": "Varun",
      "age": 26,
      "email": "[email protected]"
    }
  ]
}

Body-

{
    "name": "abc",
    "age": 20,
    "email": "[email protected]"
}

Output-

{
"id": "51fd",
"name": "abc",
"age": 20,
"email": "[email protected]"

}