Hi,
I've a problem with new patch,

As an example:
Subject: =?KOI8-R?B?8NLJ18XUIQ==?=
From: =?KOI8-R?B?4czFy9PBzsTSIPfPzMvP1w==?= <email@gmail.com>

Becomes:
Subject: п÷я─п╦п╡п╣я┌!
From: Александр Волков <email@gmail.com>

It should be as follows,
Subject: Привет!

So the subject line being modified to KOI8-R , but not to UTF-8.

Thanks in advance!