CONNECT table with INET6 field produces warnings upon SELECT

create table t1 (a inet6) engine=CONNECT table_type=DOS FILE_NAME='t1.dos';

insert into t1 values ('::');

select * from t1;

MariaDB [test]> select * from t1;

+------+

| a    |

+------+

| ::   |

+------+

1 row in set, 2 warnings (0.000 sec)

MariaDB [test]> show warnings;

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

| Level   | Code | Message                                                         |

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

| Warning | 1292 | Incorrect inet6 value: '::' for column `test`.`t1`.`a` at row 1 |

| Warning | 1105 | Out of range value :: for column 'a' at row 1                   |

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

2 rows in set (0.000 sec)