dynamodbstreams describe-stream shows stream not found but the stream is there in list-streams

Steps to recreate:
1. create dynamodb table, 
```
aws dynamodb create-table --table-name MusicCollection --attribute-definitions AttributeName=Artist,AttributeType=S AttributeName=SongTitle,AttributeType=S --key-schema AttributeName=Artist,KeyType=HASH AttributeName=SongTitle,KeyType=RANGE --provisioned-throughput ReadCapacityUnits=5,WriteCapacityUnits=5 --endpoint http://localhost:4569
```

2. add stream
```
aws dynamodb update-table --table-name MusicCollection --stream-specification StreamEnabled=true,StreamViewType=NEW_IMAGE --endpoint http://localhost:4569
{
    "TableDescription": {
        "TableArn": "arn:aws:dynamodb:eu-central-1:000000000000:table/MusicCollection", 
        "AttributeDefinitions": [
            {
                "AttributeName": "Artist", 
                "AttributeType": "S"
            }, 
            {
                "AttributeName": "SongTitle", 
                "AttributeType": "S"
            }
        ], 
        "ProvisionedThroughput": {
            "NumberOfDecreasesToday": 0, 
            "WriteCapacityUnits": 5, 
            "LastIncreaseDateTime": 0.0, 
            "ReadCapacityUnits": 5, 
            "LastDecreaseDateTime": 0.0
        }, 
        "TableSizeBytes": 0, 
        "TableName": "MusicCollection", 
        "TableStatus": "ACTIVE", 
        "StreamSpecification": {
            "StreamViewType": "NEW_IMAGE", 
            "StreamEnabled": true
        }, 
        "LatestStreamLabel": "2019-09-21T10:47:14.246", 
        "KeySchema": [
            {
                "KeyType": "HASH", 
                "AttributeName": "Artist"
            }, 
            {
                "KeyType": "RANGE", 
                "AttributeName": "SongTitle"
            }
        ], 
        "ItemCount": 0, 
        "CreationDateTime": 1569062831.736, 
        "LatestStreamArn": "arn:aws:dynamodb:eu-central-1:000000000000:table/MusicCollection/stream/2019-09-21T10:47:14.246"
    }
}
```
3. Note LatestStreamARN from output ```"LatestStreamArn": "arn:aws:dynamodb:eu-central-1:000000000000:table/MusicCollection/stream/2019-09-21T10:47:14.246"```

4. List streams:
```
aws dynamodbstreams list-streams --endpoint http://localhost:4570                                                                                                                  
{
    "LastEvaluatedStreamArn": "TODO", 
    "Streams": [
        {
            "TableName": "MusicCollection", 
            "StreamArn": "arn:aws:dynamodb:eu-central-1:000000000000:table/MusicCollection/stream/2019-09-21T10:47:16", 
            "StreamLabel": "TODO"
        }
    ]
}
```
5. Compare StreamARN to step 3.

Expected behavior: they should match (AWS dynamodb/streams behavior)
global SEQUENCE_NUMBER_COUNTER
    kinesis = aws_stack.connect_to_service('kinesis')
    for record in records:
        if 'SequenceNumber' not in record['dynamodb']:
            record['dynamodb']['SequenceNumber'] = str(SEQUENCE_NUMBER_COUNTER)
            SEQUENCE_NUMBER_COUNTER += 1
        table_arn = record['eventSourceARN']
        stream = DDB_STREAMS.get(table_arn)
        if stream:
            table_name = table_name_from_stream_arn(stream['StreamArn'])
            stream_name = get_kinesis_stream_name(table_name)
            kinesis.put_record(StreamName=stream_name, Data=json.dumps(record), PartitionKey='TODO')
@app.route('/', methods=['POST'])
def post_request():
    action = request.headers.get('x-amz-target')
    data = json.loads(to_str(request.data))
    result = {}
    kinesis = aws_stack.connect_to_service('kinesis')
    if action == '%s.ListStreams' % ACTION_HEADER_PREFIX:
        result = {
            'Streams': list(DDB_STREAMS.values()),
            'LastEvaluatedStreamArn': 'TODO'
        }
    elif action == '%s.DescribeStream' % ACTION_HEADER_PREFIX:
        for stream in DDB_STREAMS.values():
            if stream['StreamArn'] == data['StreamArn']:
                result = {
                    'StreamDescription': stream
                }