Trying to UPDATE a Virtual Column does not produce an error

I created a table with a virtual column, tried to update the virtual column, and no error was issued.

MariaDB [test]> DROP VIEW IF EXISTS `t1`;
Query OK, 0 rows affected, 1 warning (0.01 sec)

MariaDB [test]> DROP TABLE IF EXISTS `t1`;
Query OK, 0 rows affected (0.11 sec)

MariaDB [test]> CREATE TABLE `t1` (
-> `a` INTEGER UNSIGNED NULL DEFAULT NULL,
-> `b` INTEGER UNSIGNED GENERATED ALWAYS AS (`a` + 100) VIRTUAL
-> )
-> ENGINE = Aria
-> ROW_FORMAT = PAGE;
Query OK, 0 rows affected (0.21 sec)

MariaDB [test]> UPDATE `t1` SET `b` = 1;
Query OK, 0 rows affected (0.01 sec)
Rows matched: 0 Changed: 0 Warnings: 0