I'm trying to query the thread FQL table to get all unread messages, and also the count of unread items in the thread.

This is how I query the table:

SELECT thread_id,updated_time,snippet,snippet_author,unread FROM thread WHERE folder_id=0 AND unread!=0

From reading the doc to which I linked above, it seems to me that unread should include the count of unread messages in the thread.

However, I just tested the above call and Facebook gives me back a value of unread=1, despite the thread in question having 4 unread items.

This is how the thread looks on facebook.com (notice the (4), showing that unread should be 4):

This is what the API returns to me, which is wrong (notice the "unread":1):

{
  "data":[
    {
      "name":"messages",
      "fql_result_set":[
        {
          "thread_id":"BLAH BLAH BLAH",
          "updated_time":1333317140,
          "snippet":"BLAH BLAH BLAH",
          "snippet_author":BLAH,
          "unread":1
        }
      ]
    }
  ]
}

Am I doing something wrong, or is this a bug?