Wrong result (missing rows) with InnoDB, index_merge, AND and OR conditions

--source include/have_innodb.inc

CREATE TABLE t1 (

  id INT NOT NULL,

  state VARCHAR(64),

  capital VARCHAR(64),

  UNIQUE KEY (id),

  KEY (state),

  KEY (capital)

) ENGINE=InnoDB;

INSERT INTO t1 VALUES  

  (1,'Arizona','Phoenix'), 

  (2,'Hawaii','Honolulu'),

  (3,'Georgia','Atlanta'), 

  (4,'Florida','Tallahassee'), 

  (5,'Alaska','Juneau'),

  (6,'Michigan','Lansing'),

  (7,'Pennsylvania','Harrisburg'),

  (8,'Virginia','Richmond')

;

SELECT * FROM t1 FORCE KEY (state,capital) 

WHERE ( state = 'Alabama' OR state >= 'Colorado' ) AND id IS NOT NULL AND id != 9 

   OR ( capital >= 'Topeka' OR state = 'Kansas' ) AND state != 'Texas'

;

MariaDB [test]> SELECT * FROM t1 FORCE KEY (state,capital) 

    -> WHERE ( state = 'Alabama' OR state >= 'Colorado' ) AND id IS NOT NULL AND id != 9 

    ->    OR ( capital >= 'Topeka' OR state = 'Kansas' ) AND state != 'Texas'

    -> ;

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

| id | state    | capital  |

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

|  8 | Virginia | Richmond |

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

1 row in set (0.00 sec)

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

| id | state        | capital     |

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

|  4 | Florida      | Tallahassee |

|  3 | Georgia      | Atlanta     |

|  2 | Hawaii       | Honolulu    |

|  6 | Michigan     | Lansing     |

|  7 | Pennsylvania | Harrisburg  |

|  8 | Virginia     | Richmond    |

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

6 rows in set (0.00 sec)