Apple Mail multipart message not displayed correctly

"Herbert J. Skuhra" <[email protected]> Thu, 01 Feb 2018 22:30:42 +0100

Newsgroups	gmane.mail.wanderlust.general
Message-ID	<87shakbdod.wl-herbert__43352.1165549338$1517520614$gmane$org@gojira.at>

Hi,

today I received another e-mail that is not displayed correctly in
wl.

Neomutt shows:

  I     1 <no description>                                       [multipa/alternativ, 7bit, 109K]
  I     2 ><no description>                                   [text/plain, quoted, utf-8, 0.6K]
  I     3 ><no description>                                         [multipa/mixed, 7bit, 108K]
  I     4   ><no description>                                  [text/html, quoted, utf-8, 5.7K] 
  I     5   >document.pdf                                           [applica/pdf, base64, 101K]
  I     6   ><no description>                                 [text/html, 7bit, us-ascii, 0.4K]

In wl I only see

 [1  <text/plain; utf-8 (quoted-printable)>]
 [2  <multipart/mixed (7bit)>

There is obviously no way to access the pdf.

The message was created with

Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\))
X-Mailer: Apple Mail (2.3124)

Is this a known issue?

Thanks.

--
Herbert