Create and populate tables t1 and t2 with the following commands:

CREATE TABLE t1 (pk INTEGER PRIMARY KEY, i INTEGER NOT NULL);
INSERT INTO t1 VALUES (11,0);
INSERT INTO t1 VALUES (12,5);
INSERT INTO t1 VALUES (15,0);
CREATE TABLE t2 (pk INTEGER PRIMARY KEY, i INTEGER NOT NULL);
INSERT INTO t2 VALUES (11,1);
INSERT INTO t2 VALUES (12,2);
INSERT INTO t2 VALUES (15,4);

The subquery
SELECT * FROM t1
WHERE pk IN (SELECT it.pk FROM t2 JOIN t2 AS it ON it.i=it.i WHERE t1.i);

returns wrong results with the setting
set optimizer_switch='semijoin=on'; :

MariaDB [test]> set optimizer_switch='semijoin=on';
Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> SELECT * FROM t1
-> WHERE pk IN (SELECT it.pk FROM t2 JOIN t2 AS it ON it.i=it.i WHERE t1.i);
-----+

-----+

-----+

With the setting:
set optimizer_switch='semijoin=off';
the result is correct:

MariaDB [test]> set optimizer_switch='semijoin=off';
Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> SELECT * FROM t1
-> WHERE pk IN (SELECT it.pk FROM t2 JOIN t2 AS it ON it.i=it.i WHERE t1.i);
-----+

-----+

-----+
1 row in set (0.01 sec)

The bug is reproducible on both 5.3 tree and 5.3-subqueries-mwl90