sql_mode=oracle: caller function can't catch the user defined exception from callee

drop function if exists  func1;

delimiter //

CREATE FUNCTION func1 ( 

    i_var int

) RETURN DATE IS

    r_c2 DATE := '2025-01-01';

    myexception1 EXCEPTION;

    myexception2 EXCEPTION;

BEGIN

    RAISE myexception1;

    RETURN r_c2;

EXCEPTION

    WHEN myexception1 THEN

        RAISE myexception1;

END;

//

delimiter ;

drop function if exists  func2;

delimiter //

CREATE FUNCTION func2 ( 

    i_var int

) RETURN DATE IS

    r_c2 DATE := '2025-01-01';

    myexception1 EXCEPTION;

    myexception2 EXCEPTION;

BEGIN

    r_c2 := func1(i_var);

EXCEPTION

    WHEN myexception1 THEN

        return r_c2;

END;

//

delimiter ;

delimiter //

declare

    v_val DATE;

begin

    v_val := func2(4);

    select v_val from dual;

end;

//

delimiter ;

MariaDB [test]> declare

    ->     v_val DATE;

    -> begin

    ->     v_val := func2(4);

    ->     select v_val from dual;

    -> end;

    -> //

ERROR 1644 (45000): Unhandled user-defined exception condition