sophia.api.getReceivedDocuments not working

[laurencehardmanarktree]

Configuration

sophiatx-alexandria-api version 1.0.18
node --version 8.15.1

Context

Within express.js application

Description

When posting custom JSON to a specified address, say 'arktree1', using something like the below:

/* POST to /json */
router.post('/json', function (req, res, next) {
    sophia.api.makeCustomJSONOperation(20646, 'arktree2', ['arktree1'], JSON.stringify(req.body), '<REDACTED PRIVATE KEY>', function(err,response){
        console.log(response);
        console.log(err);
        res.json(response);
    });
});

A suitable response is returned, indicating that the data was successfully transmitted:

{
    "ref_block_num": 60381,
    "ref_block_prefix": 4108162935,
    "expiration": "2019-05-15T07:17:12",
    "operations": [
        [
            "custom_json",
            {
                "fee": "0.010000 SPHTX",
                "sender": "arktree2",
                "recipients": [
                    "arktree1"
                ],
                "app_id": 20646,
                "json": "{\"some-key\":\"some-val-26042019\",\"anotherKey\":\"another-val-15052019\"}"
            }
        ]
    ],
    "extensions": [],
    "signatures": [
        "<REDACTED>"
    ],
    "transaction_id": "df69a1f7c172c65ac04b8e2b8dc08e4df433e1fa",
    "block_num": 6679519,
    "transaction_num": 0
}

However, when using the sophia.api.getReceivedDocuments method as below:

/* GET Documents sent to 'arktree1' */
router.get('/documents', function(req,res,next) {

  sophia.api.getReceivedDocuments(20646, 'arktree1', 'by_recipient', '2018-10-06T09:35:13.85251Z', '1000', function(err,response){
     console.log(err,response);
     res.json(response);
  });
});

Only 1 result is returned:

{
    "app_id": 20646,
    "binary": "false",
    "recipients": "arktree1",
    "sender": "arktree1",
    "data": "{\"owner\":\"Rooibos\",\"rfid\":7040281458,\"grade\":\"20\",\"weight\":125,\"locations\":[{\"name\":\"Shed\",\"owner\":\"Rooibos\",\"accepted\":\"2019-01-10 20:13:20\"},{\"name\":\"Delivery Truck (BKB 001 EC)\",\"owner\":\"BKB\",\"accepted\":\"2019-01-10 20:13:21\"}]}",
    "received": "2019-01-10T19:46:57"
}

It is expected to return the first 1000 results sent to arktree1 starting from the specified date/time - which should include the documents we have just sent using sophia.api.makeCustomJSONOperation, however only 1 document is returned - and is not related to the data we just posted.