rack_reservation does not set correct user

[FalcoSuessgott]

NetBox version

v2.11.1

Python version

3.9

Steps to Reproduce

curl -X POST "http://localhost:8000/api/dcim/rack-reservations/" -H "accept: application/json" -H "Authorization: Token 0123456789abcdef0123456789abcdef01234567" -H "Content-Type: application/json" -H "X-CSRFToken: PyMWmxAR5J2DM31IJ1dhdUvv3p5xlEDhh5Qh2XUqJkBA5PgkjZAwCqDEUheK6b17" -d "{  "rack": 7,  "units": [5,6],  "user": 8,  "description": "string"}"

results in:

{
  "id": 8,
  "url": "http://localhost:8000/api/dcim/rack-reservations/8/",
  "display": "Reservation for rack racks_1",
  "rack": {
    "id": 7,
    "url": "http://localhost:8000/api/dcim/racks/7/",
    "display": "racks_1",
    "name": "racks_1",
    "display_name": "racks_1"
  },
  "units": [
    5,
    6
  ],
  "created": "2021-06-01",
  "user": {
    "id": 1,
    "url": "http://localhost:8000/api/users/users/1/",
    "display": "admin",
    "username": "admin"
  },
  "tenant": null,
  "description": "string",
  "tags": [],
  "custom_fields": {}
}

Expected Behavior

I expect the rack reservation to be mapped to user with the id 8.

Observed Behavior

Instead of the rack_reservation is mapped to the admin account (id=1).