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I get a count of 4 and a result of 2 documents when I do the following on a sharded collection

mongos> db.agg_collection.find(

{"_id.summary_id": "c48b9bb63", "_id.placement_id": "1"}

).count()
4
mongos> db.agg_collection.find(

{"_id.summary_id": "c48b9bb63", "_id.placement_id": "1"}

).pretty()
{
"_id" :

{ "placement_id" : "1", "summary_id" : "c48b9bb63", "new_or_used" : "N" }

,
"value" : 'hidden for patent reasons'
}
{
"_id" :

{ "placement_id" : "1", "summary_id" : "c48b9bb63", "new_or_used" : "U" }

,
"value" : 'hidden for patent reasons'
}

duplicates

SERVER-3645 Sharded collection counts (on primary) can report too many results

SERVER-8405 sharded count may incorrectly count migrating or orphaned documents (does not filter using chunk manager)