MIN giving wrong results

In build 5.5.0-2669,

create bucket: simple_table_db_4817420_simple_table

load the following data:

{
"datetime_field1": "2012-03-23 00:00:00",
"decimal_field1": 4
},
{
"datetime_field1": "2001-12-23 00:00:00",
"decimal_field1": 28
},
{
"datetime_field1": "2011-05-14 00:00:00",
"decimal_field1": 28
},
{
"datetime_field1": "2001-08-04 00:00:00",
"decimal_field1": 34
},
{
"datetime_field1": "2014-08-14 00:00:00",
"decimal_field1": 36
},
{
"datetime_field1": "2010-11-11 00:00:00",
"decimal_field1": 39
}

Create index:
CREATE INDEX simple_table_aggregate_pushdown_index_24366568 ON simple_table_db_4817420_simple_table( decimal_field1 , datetime_field1 ) WHERE   decimal_field1  IN [  4 , 28 , 34 , 36 , 39  ]

Run the following query (gives incorrect results):

SELECT MIN( datetime_field1 ) FROM   simple_table_db_4817420_simple_table    WHERE   decimal_field1  IN [  4 , 28 , 34 , 36 , 39  ]

[
{
"$1": "2012-03-23 00:00:00"
}
]

Run the following query (gives correct results):

SELECT MIN( datetime_field1 ) as M1, MAX( datetime_field1) as M2 FROM   simple_table_db_4817420_simple_table  WHERE   decimal_field1  IN [  4 , 28 , 34 , 36 , 39  ]

[
{
"M1": "2001-08-04 00:00:00",
"M2": "2014-08-14 00:00:00"
}
]