为什么v2和v3权限/列表之间的输出差异结果

I am very new at this. So please be patient in my lingo and explanation.

I would like to know is this a google limitation or problem or am I using it incorrectly?

I am moving from v2beta to v3 for permissions/list call. I see that v2beta result have more detailed. I notice there are many missing fields, the specific field I am interested in is 'domain'. When I run the v3 code (my backend code) it contains domain but the data is null, I am using fields=*. I verified it with v2 API and the domain value is populated

As you can see there is no domain for v3 using fields=*

{
 "kind": "drive#permissionList",
 "permissions": [
  {
   "kind": "drive#permission",
   "id": "####################",
   "type": "user",
   "emailAddress": "#########",
   "role": "organizer",
   "displayName": "Admin User",
   "teamDrivePermissionDetails": [
    {
     "teamDrivePermissionType": "member",
     "role": "organizer",
     "inherited": false
    }
   ],
   "permissionDetails": [
    {
     "permissionType": "member",
     "role": "organizer",
     "inherited": false
    }
   ],
   "deleted": false
  }
 ]
}

For v2

{
 "kind": "drive#permissionList",
 "etag": "\"##########/#############\"",
 "selfLink": "https://www.googleapis.com/drive/v2/files/########/permissions?supportsTeamDrives=true",
 "items": [
  {
   "kind": "drive#permission",
   "etag": "\"################\"",
   "id": "##############",
   "selfLink": "https://www.googleapis.com/drive/v2/files/#############/permissions/#############",
   "name": "Admin User",
   "emailAddress": "###############",
   "domain": "<the value is correct, just hidden>",
   "role": "organizer",
   "type": "user",
   "teamDrivePermissionDetails": [
    {
     "teamDrivePermissionType": "member",
     "role": "organizer",
     "inherited": false
    }
   ],
   "permissionDetails": [
    {
     "permissionType": "member",
     "role": "organizer",
     "inherited": false
    }
   ],
   "deleted": false
  }
 ]
}

What am I missing? Please help!!! Thanks in advance.

I have verified it with 'Try the API' https://developers.google.com/drive/api/v3/reference/permissions/list and https://developers.google.com/drive/api/v2/reference/permissions/list

According to the permission resources, https://developers.google.com/drive/api/v3/reference/permissions#resource, domain should be there. But it isn't.