FROM_UNIXTIME(0) used in WHERE gives warning and results in no data being returned

Using FROM_UNIXTIME(0) in WHERE results in warning with no data returned. The code worked correctly in mariadb 11.6.2

Example query:
SELECT * FROM `some_table` WHERE (`timestamp` >= FROM_UNIXTIME(0) OR `timestamp` IS NULL)

Example result:
/* Warning: (1292) Truncated incorrect unixtime value: '0.0' */
/* Affected rows: 0 Found rows: 0 Warnings: 1 Duration for 1 query: 0.000 sec. */

db-fiddle to assist reproduction
https://www.db-fiddle.com/f/cmPANek4oQkNfFMRLrfYSA/0

The same problem exist with the invers function:

MariaDB [test]> select unix_timestamp("1970-01-01 02:00:00");

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

| unix_timestamp("1970-01-01 02:00:00") |

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

|                                  NULL |

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