Big messages are not shown with default settings

Checklist

• I have used the search function to see if someone else has already submitted the same bug report.
• I will describe the problem with as much detail as possible.

App

Thunderbird for Android

App version

15.0

Where did you get the app from?

F-Droid

Android version

16, GrapheneOS

Steps to reproduce

• Open your Inbox or any other folder on IMAP server
• List through the messages

Expected behavior

All the messages should be in place on the list!
On opening, if the message is lager than threshold set in "Accound settings/Fetching mail/Fetch messages up to", conformation dialog should appear before downloading the full message body.

Actual behavior

Some messages with attachments (presumably, big ones) are just missing in the list. So user don't have even clue about their existence.
If the option above set to "any size (no limit)", the missing messages are back (by default, it's 32KiB).

Start by reproducing the issue in Thunderbird for Android with an IMAP folder, the default 32 KiB “Fetch messages up to” setting, and a message with attachments. Trace the message-list loading and opening flow around this setting; done means oversized messages remain listed and opening one prompts before downloading the full body.