Saving inlined unbuttonized attachment

How can I save the plain text attachment below without typing the file
name in by hand? X m (gnus-summary-save-parts) doesn't do anything in
this case. Changing mm-automatic-display, mm-inlined-types,
gnus-buttonized-mime-types, and gnus-inhibit-mime-unbuttonizing did not
help either.

Is this a bug, or I missed some configuration subtlety somewhere? Is
GNUS suddenly ignoring the Content-Disposition header?

I understand that GNUS treats this attachment like it's the message body,
but can this obvious optimization be skipped?

I had a discussion on this regard before on info-gnus-english. Thanks
Adam Sj=F8gren, I got a few good tips but nothing definitive:

https://lists.gnu.org/archive/html/info-gnus-english/2025-11/msg00001.html


The message is:


Return-Path: <...>
Received: <...>
From: <...>
To: <...>
Subject: <...>
Date: <...>
Message-ID: <...>
MIME-Version: 1.0
Content-Type: text/plain
Content-Disposition: attachment; filename=3D"PlainTextFile.txt"

This text is in the attached file that I want to save.