Error 1370 not handled in stored procedures

MariaDB [test]> CREATE USER u2;

Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> DELIMITER ||

MariaDB [test]> CREATE DEFINER = u2 PROCEDURE p()

    -> SQL SECURITY DEFINER

    -> BEGIN

    -> DECLARE EXIT HANDLER

    -> FOR 1370

    -> SELECT 1370 AS `ERROR`;

    -> DECLARE EXIT HANDLER

    -> FOR SQLSTATE '42000'

    -> SELECT '42000' AS `ERROR`;

    -> SHOW PROCESSLIST;

    -> SELECT 'OK';

    -> END;

    -> ||

Query OK, 0 rows affected (0.03 sec)

MariaDB [test]> DELIMITER ;

MariaDB [test]> CALL p();

ERROR 1370 (42000): execute command denied to user 'u2'@'%' for routine 'test.p'