In table partitioned by INET6 all values go into the same partition

create table t1 (a inet6) partition by key(a) partitions 2;

insert into t1 values ('0:db8::ff00:42:8329'),('2001:db8::ff00:42:8329'),('::'),('::192.0.2.128'),('::ffff:192.0.2.128');

select * from t1 partition (p0);

select * from t1 partition (p1);

MariaDB [test]> select * from t1 partition (p0);

Empty set (0.000 sec)

MariaDB [test]> select * from t1 partition (p1);

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

| a                      |

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

| 0:db8::ff00:42:8329    |

| 2001:db8::ff00:42:8329 |

| ::                     |

| ::192.0.2.128          |

| ::ffff:192.0.2.128     |

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

5 rows in set (0.001 sec)

MariaDB [test]> create table t2 (a binary(22)) partition by key(a) partitions 2;

Query OK, 0 rows affected (0.342 sec)

MariaDB [test]> insert into t2 values ('0:db8::ff00:42:8329'),('2001:db8::ff00:42:8329'),('::'),('::192.0.2.128'),('::ffff:192.0.2.128');

Query OK, 5 rows affected (0.050 sec)

Records: 5  Duplicates: 0  Warnings: 0

MariaDB [test]> select * from t2 partition (p0);

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

| a                      |

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

| 0:db8::ff00:42:8329    |

| ::192.0.2.128          |

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

2 rows in set (0.000 sec)

MariaDB [test]> select * from t2 partition (p1);

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

| a                      |

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

| 2001:db8::ff00:42:8329 |

| ::                     |

| ::ffff:192.0.2.128     |

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

3 rows in set (0.000 sec)