Article buffer mode-line charset indicator shows windows-1252

[Neil Woods]

I'm currently running the latest Debian packaged emacs-snapshot,
together with the latest No Gnus (checked out today).

The character set indicator on the mode-line in the article buffer
incorrectly indicates that the article displayed is a windows-1252
buffer (it show a "*", which the tooltip indicates as windows-1252).

This happens in nearly all cases, even articles with specific MIME
headers indicating, e.g., 
        Content-type: text/plain; charset="iso-8859-1"
and articles with no MIME headers.

After a cursory examination it seems articles marked with a
charset="us-ascii" MIME header are not affected, and show up with a "1"
in the mode-line.

The only settings I have in my ~/.emacs that could possibly be relevant
are

(set-language-environment "Latin-1")

This has been happening for some time now. It does not happen if I use
the Gnus version that comes bundled with emacs-snapshot (5.11).

Is this a known bug, or what am I missing here?

I've checked the usual places (Google, newsgroup searches) but haven't
been able to find anything relevant.

Any help would be greatly appreciated in trying to track this down.
-- 
Neil.
<Shinobi> There are worse things than Perl....ASP comes to mind