Wrong result for query with window function when all tables are optimized away

create table t1 (id int);

insert into t1 values (1), (2), (3), (2);

select sum(max(id)) over (order by max(id)) from t1;

MariaDB [test]> select sum(max(id)) over (order by max(id)) from t1;

+--------------------------------------+

| sum(max(id)) over (order by max(id)) |

+--------------------------------------+

| 3                                    |

+--------------------------------------+

MariaDB [test]> create index idx on t1(id);

Query OK, 0 rows affected (0.05 sec)

Records: 0  Duplicates: 0  Warnings: 0

MariaDB [test]> select sum(max(id)) over (order by max(id)) from t1;

+--------------------------------------+

| sum(max(id)) over (order by max(id)) |

+--------------------------------------+

| NULL                                 |

+--------------------------------------+