EXCEPT with identical left/right queries isn't eliminated

q1: SELECT * FROM TABLES CROSS JOIN VIEWS ON TRUE
q2: SELECT * FROM TABLES CROSS JOIN VIEWS ON NOT FALSE;
Since q1 is Semantically equivalent to q2, q1 EXCEPT q2 should always return an empty set and consume minimal execution time. However, the query returns a non-empty result (8670 rows in set ) and wastes some computation time (6.337 sec) compared to DBMSs without this bug.
MariaDB > use information_schema;
MariaDB [information_schema]> SELECT * FROM TABLES CROSS JOIN VIEWS ON TRUE EXCEPT SELECT * FROM TABLES CROSS JOIN VIEWS ON NOT FALSE;
...
8670 rows in set (6.337 sec)