When updating an invoice, nested resources are not updated

When I edit an invoice, the batches and tasks are not updated. Here is the payload which is sent:

{
  "@id": "http://localhost:8000/customer-invoices/1/",
  "title": "test test",
  "identifier": "0123456789000",
  "state": "",
  "invoicingDate": "2020-10-21",
  "tvaRate": 13,
  "additionalText": "",
  "batches": [
    {
      "@id": "http://localhost:8000/batchs/1/",
      "title": "Lot 1",
      "tasks": [
        {
          "@id": "http://localhost:8000/tasks/1/",
          "title": "Tache 1",
          "htAmount": 10
        },
        {
          "@id": "http://localhost:8000/tasks/2/",
          "title": "Tache 2",
          "htAmount": 22
        }
      ]
    }
  ],
  "@context": {
    "@vocab": "http://happy-dev.fr/owl/#",
    "rdf": "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
    "rdfs": "http://www.w3.org/2000/01/rdf-schema#",
    "ldp": "http://www.w3.org/ns/ldp#",
    "foaf": "http://xmlns.com/foaf/0.1/",
    "name": "rdfs:label",
    "acl": "http://www.w3.org/ns/auth/acl#",
    "permissions": "acl:accessControl",
    "mode": "acl:mode",
    "geo": "http://www.w3.org/2003/01/geo/wgs84_pos#",
    "lat": "geo:lat",
    "lng": "geo:long"
  }
}

@calummackervoy do you see something wrong in this?