Error "Couldn't fix table with quick recovery: Found wrong number of deleted records" and Warning "Enabling keys got errno 0 on test.tmp, retrying"

CREATE TEMPORARY TABLE tmp (a INT, b INT) ENGINE=MyISAM;

ALTER TABLE tmp ADD FOREIGN KEY (b) REFERENCES tmp (a);

INSERT INTO tmp VALUES (1,1);

DELETE FROM tmp LIMIT 2;

--error ER_BLOB_KEY_WITHOUT_LENGTH

ALTER TABLE tmp CHANGE b c TEXT NULL DEFAULT '';

INSERT INTO tmp SELECT * FROM tmp;

1034: Couldn't fix table with quick recovery: Found wrong number of deleted records

2019-01-11 14:42:28 140493904692992 [Warning] Warning: Enabling keys got errno 0 on test.tmp, retrying