Invalid data from UTF16 strings in avrorouter

The avrorouter doesn't work when the utf16 character set is used. The following test case should generate the proper output but it produces empty strings instead.

CREATE TABLE t1 (data varchar(30) NOT NULL) DEFAULT CHARSET=utf16;

INSERT INTO t1 VALUES ("Hello World"), ("Բարեւ աշխարհ"), ("こんにちは世界"), ("你好，世界"), ("Привет мир");

Changing the charset to utf8mb4 generates correct output.