Wrong result on character comparison inside a view

CREATE TABLE t1 (fld VARCHAR(1) CHARSET utf8);

INSERT INTO t1 VALUES ('x'),('y');

SELECT * FROM t1 WHERE fld BETWEEN 'a' AND CHAR(222);

CREATE OR REPLACE VIEW v1 AS

  SELECT * FROM t1 WHERE fld BETWEEN 'a' AND CHAR(222);

SELECT * FROM v1; 

DROP VIEW v1;

DROP TABLE t1;

MariaDB [test]> SELECT * FROM t1 WHERE fld BETWEEN 'a' AND CHAR(222);

+------+

| fld  |

+------+

| x    |

| y    |

+------+

2 rows in set (0.00 sec)

MariaDB [test]> 

MariaDB [test]> CREATE OR REPLACE VIEW v1 AS

    ->   SELECT * FROM t1 WHERE fld BETWEEN 'a' AND CHAR(222);

Query OK, 0 rows affected (0.00 sec)

MariaDB [test]> 

MariaDB [test]> SELECT * FROM v1; 

Empty set, 1 warning (0.00 sec)

MariaDB [test]> SHOW WARNINGS;

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

| Level   | Code | Message                             |

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

| Warning | 1300 | Invalid utf8 character string: 'DE' |

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

1 row in set (0.00 sec)

commit 1427e1db99ac44dedbc78e8655742a8ed9bfd755

Author: Alexander Barkov <bar@mariadb.org>

Date:   Mon Sep 1 20:57:32 2014 +0400

    MDEV-6661 PI() does not work well in UCS2/UTF16/UTF32 context

    MDEV-6666 Malformed result for CONCAT(utf8_column, binary_string)

    Item_static_string_func::safe_charset_converter() and

    Item_hex_string::safe_charset_converter() did not

    handle character sets with mbminlen>1 properly, as well as

    did not handle conversion from binary to multi-byte well.

    Introducing Item::const_charset_converter(), to reuse it in a number

    of Item_*::safe_charset_converter().