Attachment not visible

Steps to reproduce

Received dmarc-report from google does not show attachment.
Same issue as
https://github.com/nextcloud/mail/issues/9957
(that one was closed unfortunately ..)

Showing below the redacted body of the email... let me know if that is sufficient.

[..some other headers, like Received, ARC and DKIM headers..]
MIME-Version: 1.0
X-Received: by 2002:a05:620a:2792:b0:7c0:79c3:fd2a with SMTP id
 af79cd13be357-7c0cef66bd5mr2337314985a.43.1740481224479; Tue, 25 Feb 2025
 03:00:24 -0800 (PST)
Date: Mon, 24 Feb 2025 15:59:59 -0800
Message-ID: <13446300399950255636@google.com>
Subject: Report domain: REDACTED Submitter: google.com Report-ID: 13446300399950255636
From: noreply-dmarc-support@google.com
To: REDACTED
Content-Type: application/zip; 
	name="google.com!REDACTED!1740355200!1740441599.zip"
Content-Disposition: attachment; 
	filename="google.com!REDACTED!1740355200!1740441599.zip"
Content-Transfer-Encoding: base64

REDACTED, base64 endcoded zip file with xml insideXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Expected behavior

While the list overview shows a paper clip to indicate an attachment, if you open the email it does not show anything, just the title.

My suspicion is that this might be due to the fact that the email does not contain any text body, just the attachment.

Actual behavior

Show attachment

Mail app version

4.2.2

Nextcloud version

30.0.6

Mailserver or service

postfix / dovecod

Operating system

Gentoo Linux

PHP engine version

PHP 8.3

Nextcloud memory caching

No response

Web server

Nginx

Database

PostgreSQL

Additional info

No response

No source file or test is named. Start by reproducing the supplied Google DMARC message in Mail 4.2.2 and trace the attachment display path for messages with no text body. Done means the ZIP attachment is listed when the email is opened, with a regression test covering this MIME shape.