misleading error when partitioning a table with an utf8 space after backticks on partition names

mysql -A

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MariaDB [(none)]> use test

Database changed

MariaDB [test]> CREATE TABLE actor_backticks_around_p1 (   actor_id smallint(5) unsigned NOT NULL AUTO_INCREMENT,   first_name varchar(45) NOT NULL,   last_name varchar(45) NOT NULL,   last_update timestamp NOT NULL DEFAULT current_timestamp() ON UPDATE current_timestamp(),   PRIMARY KEY (actor_id,last_update),   KEY idx_actor_last_name (last_name),   KEY last_update (last_update) ) ENGINE=InnoDB DEFAULT CHARSET=utf8  PARTITION BY RANGE (unix_timestamp(last_update)) (PARTITION p0  VALUES LESS THAN (1522900800) ENGINE = InnoDB,  PARTITION `p1`  VALUES LESS THAN (1522987200) ENGINE = InnoDB);

ERROR 1479 (HY000): Syntax error: RANGE PARTITIONING requires definition of VALUES LESS THAN for each partition