TO_DATE: NLS_DATE_LANGUAGE=JAPANESE does not parse values which work in Oracle

SELECT TO_DATE('15 4月 2024','DD MONTH YYYY','NLS_DATE_LANGUAGE=JAPANESE') AS x FROM DUAL;

X

15-APR-24

MariaDB [test]> SELECT TO_DATE('15 4月 2024','DD MONTH YYYY','NLS_DATE_LANGUAGE=JAPANESE') AS x FROM DUAL;

+------+

| x    |

+------+

| NULL |

+------+

1 row in set, 1 warning (0.001 sec)

MariaDB [test]> show warnings;

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

| Level   | Code | Message                                                       |

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

| Warning | 1411 | Incorrect datetime value: '15 4月 2024' for function to_date  |

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

1 row in set (0.000 sec)