The "at" symbol (@) in user names breaks access to schemas

MariaDB [(none)]> show grants for foo;

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

| Grants for foo@%                            |

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

| GRANT all_ph TO 'foo'@'%'                   |

| GRANT USAGE ON *.* TO 'foo'@'%' REQUIRE SSL |

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

2 rows in set (0.00 sec)

MariaDB [(none)]> show grants for 'foo@bar';

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

| Grants for foo@bar@%                |

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

| GRANT all_ph TO 'foo@bar'@'%'       |

| GRANT USAGE ON *.* TO 'foo@bar'@'%' |

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

2 rows in set (0.00 sec)

(Wed, 23 Mar 2016 20:59:54 +0800)

[pashev@cat:~]

# mysql -ufoo bob_live_ph

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Welcome to the MariaDB monitor.  Commands end with ; or \g.

Your MariaDB connection id is 156

Server version: 10.1.11-MariaDB MariaDB Server

Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [bob_live_ph]> Bye

(Wed, 23 Mar 2016 21:00:32 +0800)

[pashev@cat:~]

# mysql -u'foo@bar' bob_live_ph

ERROR 1044 (42000): Access denied for user 'foo@bar'@'%' to database 'bob_live_ph'

(Wed, 23 Mar 2016 21:00:40 +0800)

[pashev@cat:~]

# mysql -u'foo@bar' -e 'show databases'

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

| Database           |

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

| information_schema |

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

(Wed, 23 Mar 2016 21:01:43 +0800)

[pashev@cat:~]

# mysql -u'foo' -e 'show databases'

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

| Database           |

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

| bob_live_au        |

| bob_live_hk        |

| bob_live_id        |

| bob_live_ph        |

| bob_live_sg        |

| bob_live_tw        |

| information_schema |

| oms_live_id        |

| oms_live_ph        |

| oms_live_sg        |

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