[10.1] ER_NO_SUCH_TABLE_IN_ENGINE followed by "Please drop the table and recreate" upon adding FULLTEXT key to table with virtual column

--source include/have_innodb.inc

CREATE TABLE t1 (a INT, b CHAR(12), c INT AS (a) VIRTUAL) ENGINE=InnoDB;

ALTER TABLE t1 ADD FULLTEXT KEY(b);

# Cleanup

DROP TABLE t1;

CURRENT_TEST: bug.corrupt2

mysqltest: At line 4: query 'ALTER TABLE t1 ADD FULLTEXT KEY(b)' failed: 1932: Table 'test.t1' doesn't exist in engine

2018-06-15 19:45:14 140505486965504 [Warning] InnoDB: table test/t1 contains 3 user defined columns in InnoDB, but 3 columns in MySQL. Please check INFORMATION_SCHEMA.INNODB_SYS_COLUMNS and http://dev.mysql.com/doc/refman/5.6/en/innodb-troubleshooting.html for how to resolve it

2018-06-15 19:45:14 140505486965504 [Warning] InnoDB: Cannot open table test/t1 from the internal data dictionary of InnoDB though the .frm file for the table exists. See http://dev.mysql.com/doc/refman/5.6/en/innodb-troubleshooting.html for how you can resolve the problem.