'Facebook sdk /me/friends/ return empty data

I'm trying to get the names and ids of friends using my application, but the data is empty.

{
  "data": [
  ],
  "summary": {
    "total_count": 1
  }
}

I'm requesting the user_friends permission and it is included. My all test Users include user_friends permission.

But I cannot get friends list. Can someone help?

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