Keys can be disabled in partitions inconsistently, leading to error "Wrong index given to a function"

--source include/have_partition.inc

CREATE TABLE t1 (a INT, KEY(a)) ENGINE=MyISAM

PARTITION BY LIST (a) (PARTITION p0 VALUES IN (1), PARTITION p1 VALUES IN (2));

INSERT INTO t1 VALUES (1),(1);

ALTER TABLE t1 DISABLE KEYS;

CREATE TABLE t2 (a INT, KEY(a)) ENGINE=MyISAM;

INSERT INTO t2 VALUES (2),(2),(2);

ALTER TABLE t1 EXCHANGE PARTITION p1 WITH TABLE t2;

SELECT COUNT(*) FROM t1 WHERE a = 1;

DROP TABLE t1, t2;

mysqltest: At line 11: query 'SELECT COUNT(*) FROM t1 WHERE a = 1' failed: ER_GET_ERRNO (1030): Got error 124 "Wrong index given to a function" from storage engine MyISAM

--source include/have_partition.inc

--source include/have_binlog_format_row.inc

--source include/master-slave.inc

CREATE TABLE t1 (a INT, KEY(a)) ENGINE=MyISAM

PARTITION BY LIST (a) (PARTITION p0 VALUES IN (1), PARTITION p1 VALUES IN (2));

INSERT INTO t1 VALUES (1);

ALTER TABLE t1 DISABLE KEYS;

CREATE TABLE t2 (a INT, KEY(a)) ENGINE=MyISAM;

INSERT INTO t2 VALUES (2),(2);

ALTER TABLE t1 EXCHANGE PARTITION p1 WITH TABLE t2;

DELETE FROM t1;

--sync_slave_with_master

--connection master

DROP TABLE t1, t2;

--source include/rpl_end.inc 

Last_Errno      1030

Last_Error      Could not execute Delete_rows_v1 event on table test.t1; Got error 124 "Wrong index given to a function" from storage engine MyISAM, Error_code: 1030; handler error HA_ERR_WRONG_INDEX; the event's master log master-bin.000001, end_log_pos 0