System-Versioned Tables inccorect joins

CREATE TABLE `t1` (

  `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,

  `x` VARCHAR(10),

  PRIMARY KEY (`id`)

)WITH SYSTEM VERSIONING; 

CREATE TABLE `t2` (

  `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,

  `t1_id` INT(10) UNSIGNED NOT NULL,

  `x` VARCHAR(10),

  PRIMARY KEY (`id`),

  KEY `t1_id_foreign` (`t1_id`),

  CONSTRAINT `t1_id_foreign` FOREIGN KEY (`t1_id`) REFERENCES `t1` (`id`) 

)WITH SYSTEM VERSIONING;

INSERT INTO t1 SET  `x` = 'a';

UPDATE t1 SET X = 'b' WHERE ID = 1;

INSERT INTO t2 SET X = 'b',t1_id=1;

SELECT t1.*,t2.* FROM t1 LEFT JOIN t2 ON t1.`id` = t2.`t1_id` ;

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

| id | X    | id   | t1_id | X    |

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

|  1 | b    |    1 |     1 | b    |

|  1 | a    | NULL |  NULL | NULL |

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

2 ROWS IN SET (0.001 sec)

expected 

SELECT t1.*,t2.* FROM t1 LEFT JOIN t2 ON t1.`id` = t2.`t1_id` ;

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

| id | X    | id   | t1_id | X    |

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

|  1 | b    |    1 |     1 | b    |

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

1 ROWS IN SET (0.001 sec)