Table rebuild fails or corrupts contents of compressed column with some character sets

CREATE OR REPLACE TABLE t (c VARCHAR(16) COMPRESSED) ENGINE=MyISAM CHARACTER SET utf32;

INSERT INTO t VALUES ('n');

ALTER TABLE t FORCE;

SELECT c, HEX(c) FROM t;

ALTER IGNORE TABLE t FORCE;

SELECT c, HEX(c) FROM t;

MariaDB [test]> ALTER TABLE t FORCE;

ERROR 1265 (01000): Data truncated for column 'c' at row 1

MariaDB [test]> SELECT c, HEX(c) FROM t;

+------+----------+

| c    | HEX(c)   |

+------+----------+

| n    | 0000006E |

+------+----------+

1 row in set (0.000 sec)

MariaDB [test]> ALTER IGNORE TABLE t FORCE;

Query OK, 1 row affected, 1 warning (0.006 sec)    

Records: 1  Duplicates: 0  Warnings: 1

MariaDB [test]> SELECT c, HEX(c) FROM t;

+------+--------+

| c    | HEX(c) |

+------+--------+

| ??   | 000000 |

+------+--------+

1 row in set (0.001 sec)