Left joined subquery gives wrong result

CREATE TABLE `table1` (

  `id` int(11) NOT NULL AUTO_INCREMENT,

  `name` varchar(255) DEFAULT NULL,                                      

  PRIMARY KEY (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=latin1;

CREATE TABLE `table2` (

  `user_id` int(11) NOT NULL,

  `table1_id` int(11) NOT NULL,

  PRIMARY KEY (`user_id`,`table1_id`)

) ENGINE=InnoDB DEFAULT CHARSET=latin1;

INSERT INTO table1 (`id`,`name`) 

	VALUES

		(1,'test1'),

		(2,'test2'),

		(3,'test3'),

		(4,'test4'),

		(5,'test5'),

		(6,'test6'),

		(7,'test7'),

		(8,'test8'),

		(9,'test9'),

		(10,'test10');

INSERT INTO table2 (`table1_id`,`user_id`)

	VALUES

	(1,1), 

	(2,2),

	(3,1),

	(4,2),

	(5,1),

	(6,2), 

	(7,1),

	(8,2),

	(9,1),

	(10,2);

SELECT t1.id, COALESCE(t2.amount, 0) AS amount 

FROM table1 t1 

  LEFT JOIN (SELECT  1 AS amount, table1_id, user_id 

  FROM    table2) t2 

    ON t2.table1_id = t1.id AND t2.user_id = 1;

1	1

2	1

3	1

4	1

5	1

6	1

7	1

8	1

9	1

10	1

1	1

2	0

3	1

4	0

5	1

6	0

7	1

8	0

9	1

10	0