TIME_TO_SEC() gives unexpected results for seconds having decimals

CREATE TABLE t1(col TIME(3))ENGINE=Columnstore;

INSERT INTO t1 VALUES('00:00:40.991');

SELECT TIME_TO_SEC('00:00:40.991') FROM t1;

+-----------------------------+

| TIME_TO_SEC('00:00:40.991') |

+-----------------------------+

|                       0.000 |

+-----------------------------+

SELECT TIME_TO_SEC('00:00:40.99') FROM t1;

+-----------------------------+

| TIME_TO_SEC('00:00:40.99') |

+-----------------------------+

|                       40.99 |

+-----------------------------+

SELECT col, TIME_TO_SEC(col) FROM t1;

+--------------+------------------+

| col          | TIME_TO_SEC(col) |

+--------------+------------------+

| 00:00:40.991 |           40.000 |

+--------------+------------------+