Possible bug in CREATE USER

MariaDB [(none)]> CREATE USER 'blocklists

    '> ,

    '> ;

    '> ;

    '> ';

Query OK, 0 rows affected (0.011 sec)

MariaDB [(none)]> DROP USER blocklists;

ERROR 1396 (HY000): Operation DROP USER failed for 'blocklists'@'%'

MariaDB [(none)]> SELECT user,host FROM mysql.user;

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

| User              | Host      |

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

| blocklists

,

;

;

 | %         |

| mariadb.sys       | localhost |

| mysql             | localhost |

| root              | localhost |

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

4 rows in set (0.001 sec)

MariaDB [(none)]> DROP USER 'blocklists%'@'%';

ERROR 1396 (HY000): Operation DROP USER failed for 'blocklists%'@'%'

MariaDB [(none)]> DROP USER 'blocklists

,

;

;'@'%';

ERROR 1396 (HY000): Operation DROP USER failed for 'blocklists\n,\n;\n;'@'%'

MariaDB [(none)]> DROP USER 'blocklists,;;'@'%';

ERROR 1396 (HY000): Operation DROP USER failed for 'blocklists,;;'@'%'