Qsr breaks string encoding

Hi!

There is some script with quoting:

CREATE OR REPLACE FUNCTION tst_fn
RETURN VARCHAR2
IS
BEGIN
RETURN q'[Тестовая строка]';
END;
/

But after running it with qsr:

CREATE OR REPLACE FUNCTION tst_fn
RETURN VARCHAR2
IS
BEGIN
RETURN '4Y4l4x4y4u4i4g4? 4x4y4w4u4q4g';
END;
/

Thanks, I can repeat this and have logged it to be fixed soon.