API Response for downloading "notes" has been changed.

We observed that while downloading the file, JSON response from API for "Notes" has been changed.
Previously JSON response were containing key as "atext" and from updated response coming as key "doc",

please find below latest response from API.

{
  "version": 27,
  "schema_version": 1,
  "doc": {
    "type": "doc",
    "attrs": {
      "table_of_contents": {
        "enabled": false,
        "allowedLevels": [
          1,
          2,
          3
        ]
      }
    },
    "content": [
      {
        "type": "paragraph",
        "content": [
          {
            "type": "text",
            "marks": [
              {
                "type": "author_id",
                "attrs": {
                  "authorId": "123"
                }
              }
            ],
            "text": "this is test 29 june note"
          }
        ]
      }
    ]
  },
  "savepoint_metadata": {
    "savepointFileId": null,
    "savepointsInfo": {},
    "shouldCreateSavepointBeforeApplyingNextVersion": false,
    "authorsSinceLastSavepoint": {
      "123": true
    },
    "allAuthorNames": {
      "123": "xxx"
    }
  },
  "last_edit_timestamp": 1688019076195
}

could you please confirm that response for downloading "Notes" has been changed if yes then can provide the documentation links ?