Table corruption with UNIQUE HASH key on a partitioned table (yet another one)

--source include/have_partition.inc

CREATE TABLE t (id int, c char(120), UNIQUE KEY USING HASH (id,c))

  PARTITION BY RANGE (id) (PARTITION p1 VALUES LESS THAN (10));

ALTER TABLE t ADD PARTITION (PARTITION p2 VALUES LESS THAN (100));

ALTER TABLE t FORCE;

ALTER TABLE t FORCE;

Query OK, 0 rows affected (0.158 sec)

Records: 0  Duplicates: 0  Warnings: 0

MariaDB [test]> ALTER TABLE t FORCE;

ERROR 1194 (HY000): Table 't' is marked as crashed and should be repaired

MariaDB [test]> ALTER TABLE t FORCE;

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

MariaDB [test]> ALTER TABLE t ADD PARTITION (PARTITION p2 VALUES LESS THAN (100));

Query OK, 0 rows affected (0.024 sec)

Records: 0  Duplicates: 0  Warnings: 0

MariaDB [test]> ALTER TABLE t FORCE;

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

MariaDB [test]> ALTER TABLE t FORCE;

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