Table corruption upon altering partitions under debug_dbug= "+d,test_pseudo_invisible"

--source include/have_partition.inc

CREATE TABLE t1 (i INT) PARTITION BY HASH (i) PARTITIONS 3;

SET debug_dbug= "+d,test_pseudo_invisible";

ALTER TABLE t1 COALESCE PARTITION 1;

SET debug_dbug= "";

SELECT * FROM t1;

# Cleanup

DROP TABLE t1;

MariaDB [test]> SELECT * FROM t1;

ERROR 1932 (42S02): Table 'test.t1' doesn't exist in engine

MariaDB [test]> SELECT * FROM t1;

ERROR 1030 (HY000): Got error 190 "Incompatible key or row definition between the MariaDB .frm file and the information in the storage engine. You have to dump an" from storage engine MyISAM