Unable to Add r Tag

[Seinosuke01]

I have one question about the group metadata.

{
   "kind": 9002,
   "content": "",
   "tags": [
     ["d", "uuid"],
     ["name", "TestGroup"],
     ["picture", "https://test.com/test.png"],
     ["about", "NIP29 Group for Test"],
     ["public"], 
     ["open"],
     ["r", "https://example.com"]
   ]
 }

When sending a request to create a group, adding an r tag and editing the group does not reflect the addition of the r tag.

The metadata response for a group using kind 39000 is shown below.

{
   "kind": 39000,
   "content": "",
   "tags": [
     ["d", "uuid"],
     ["name", "TestGroup"],
     ["picture", "https://test.com/test.png"],
     ["about", "NIP29 Group for Test"],
     ["public"], 
     ["open"]
   ]
 }

Once the addition of the r tag is realized, it could be used, for example, to set up a fixed online meeting link.