Server silently accepts explicit inserts into generated columns of temporary tables instead of returning an error

CREATE TEMPORARY TABLE t1 (a INT, v INT AS (a+1) VIRTUAL) ;

INSERT INTO t1 (a, v) VALUES (1, 99);

SELECT a, v, COUNT(*) AS t1_rows FROM t1;

DROP TEMPORARY TABLE t1;

10.11.19-opt>CREATE TEMPORARY TABLE t1 (a INT, v INT AS (a+1) VIRTUAL) ;

Query OK, 0 rows affected (0.001 sec)

10.11.19-opt>INSERT INTO t1 (a, v) VALUES (1, 99);

Query OK, 1 row affected (0.000 sec)

10.11.19-opt>SELECT a, v, COUNT(*) AS t1_rows FROM t1;

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

| a    | v    | t1_rows |

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

|    1 |    2 |       1 |

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

1 row in set (0.000 sec)

10.11.19-opt>DROP TEMPORARY TABLE t1;

Query OK, 0 rows affected (0.000 sec)

10.11.19-opt>

10.11.19-opt>CREATE TABLE bt (a INT, v INT AS (a+1) VIRTUAL);

Query OK, 0 rows affected (0.032 sec)

10.11.19-opt>INSERT INTO bt (a, v) VALUES (1, 99);

ERROR 1906 (HY000): The value specified for generated column 'v' in table 'bt' has been ignored

10.11.19-opt>