Wrong result with C style comment inside executable comment in mariadb client

SELECT 1 /*! +  1 /*aa*/ +1 */;

--exec $MYSQL -e "SELECT 1 /*! +  1 /*aa*/ +1 */;"

SELECT 1 /*! +  1 /*aa*/ +1 */;

1  +  1 /*aa*/ +1

3

1  +  1

2

MariaDB [test]>  SELECT 1 /*! +1 /*a*/ */;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 1