Query pushdown fails when local and remote database names differ

MariaDB [m8]> explain SELECT OUTR1.a FROM D AS OUTR1, D AS OUTR2 WHERE OUTR1.a=10;

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

| id   | select_type   | table | type | possible_keys | key  | key_len | ref  | rows | Extra |

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

|    1 | PUSHED SELECT | NULL  | NULL | NULL          | NULL | NULL    | NULL | NULL | NULL  |

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

MariaDB [m9]> explain SELECT OUTR1.a FROM D AS OUTR1, D AS OUTR2 WHERE OUTR1.a=10;

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

| id   | select_type | table | type | possible_keys | key  | key_len | ref  | rows | Extra                              |

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

|    1 | SIMPLE      | OUTR1 | ALL  | NULL          | NULL | NULL    | NULL | 0    | Using where                        |

|    1 | SIMPLE      | OUTR2 | ALL  | NULL          | NULL | NULL    | NULL | 0    | Using join buffer (flat, BNL join) |

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

Start server on port:3306

create database m8;use m8;

create user u3@localhost; grant all on *.* to u3@localhost;

create table D( a int);

create database m8;use m8;

create table D(a int)  ENGINE="FEDERATED" CONNECTION='mysql://u3@127.0.0.1:3306/m8/D';

explain SELECT OUTR1.a FROM D AS OUTR1, D AS OUTR2 WHERE OUTR1.a=10; 

create database m9;use m9;

create table D(a int)  ENGINE="FEDERATED" CONNECTION='mysql://u3@127.0.0.1:3306/m8/D';

explain SELECT OUTR1.a FROM D AS OUTR1, D AS OUTR2 WHERE OUTR1.a=10;