different behaviour with "INTO @var1" for MySQL and MariaDB

MySQL 5.7

mysql> (SELECT 1 INTO @var1);

Query OK, 1 row affected (0.00 sec)

MariaDB (tested with 10.4 and 10.8)

MariaDB [d1]> (SELECT 1 INTO @var1);

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'into @var1)' at line 1