INSERT..SELECT does not work for utf8 VARCHAR

This problem is repeatable in develop (and does not seem to repeat in develop-5).

DROP TABLE IF EXISTS t1;

CREATE TABLE t1 (c1 VARCHAR(32) CHARACTER SET utf8) ENGINE=ColumnStore;

INSERT INTO t1 VALUES ('a'),('b');

SELECT * FROM t1;

+------+

| c1   |

+------+

| a    |

| b    |

+------+

Looks fine so far.

DROP TABLE IF EXISTS t2;

CREATE TABLE t2 LIKE t1;

INSERT INTO t2 SELECT c1 FROM t1;

SELECT * FROM t2;

+------+

| c1   |

+------+

| NULL |

| NULL |

+------+

Looks wrong. This query is expected to return the same result set with the previous query.

Note, if I change the data type from VARCHAR(32) CHARACTER SET utf8 to

• CHAR(32) CHARACTER SET utf8, or
• VARCHAR(32) CHARACTER SET latin1

it starts to return correct results.