Flagged corruption / Wrong count upon CHECK on table with indexed virtual column

--source include/have_innodb.inc

CREATE TABLE t (a VARCHAR(64), b VARCHAR(64) AS (a) VIRTUAL, KEY(b(4)), KEY(b)) ENGINE=InnoDB;

INSERT INTO t (a) VALUES ('foobar');

CHECK TABLE t EXTENDED;

DROP TABLE t;

CREATE TABLE t (a VARCHAR(64), b VARCHAR(64) AS (a) VIRTUAL, KEY(b(4)), KEY(b)) ENGINE=InnoDB;

INSERT INTO t (a) VALUES ('foobar');

CHECK TABLE t EXTENDED;

Table	Op	Msg_type	Msg_text

test.t	check	Warning	InnoDB: Index 'b' contains 0 entries, should be 1.

test.t	check	error	Corrupt

DROP TABLE t;