[Evolution] Items in the trash reappear in the archive folder

["theapplepie differentmail com" <theapplepie differentmail com>]

Hi Evolution team!
Thanks a lot for continuously working on and improving this great app,
we have been using it for more than a decade now!

We use Evolution 3.18.5.2 (Ubuntu 16.04) and 3.34.1-2 (Ubuntu 19.10,
previously the version 3.32.1-2 in 19.04) on two different computers,
both will be updated this year. The email account this problem relates
to is configured in the same way in both Evolution versions on the two
computers. It is set up with IMAP.

For a year or even more we have a mysterious problem. Emails in the
trash folder that are usually automatically deleted from the email
server after a month reappear in the Archive folder after they are
deleted server-side. Maybe it is similar to this bug:
https://gitlab.gnome.org/GNOME/evolution/issues/580
But it does not happen immediately after the email was moved to the
trash folder but most of the time only a month later when it is deleted
from the server.

In the above mentioned bug report you asked for the work flow. Here is
ours: The emails that are read and not need to be archived are moved
(manually) to the Trash folder. The emails that are read/answered are
moved to the Archive folder, either by moving it manually or by
"deleting" it with the Delete key as the Archive folder is set as the
"Real Folder for Wastebasket/Trash". I wondered whether this last
setting might explain the behaviour but we had this settings on all
computers for many years (with different email providers) and the
reappearance of the emails only occurred for a year or so. I first
hoped it will disappear by itself but it did not. At the moment I have
to re-delete all emails and then open the trash folder in Thunderbird
and delete it there permanently. If I delete the re-deleted emails
manually from the Trash in Evolution they usually reappear again.

I can stop this problem if I set the official TRASH folder as the "Real
Folder for Wastebasket/Trash" on the computer with 3.34.1-2  (Ubuntu
19.10). But it reappears if I use the Archive folder as the the "Real
Folder for Wastebasket/Trash" like on the other computer.

Do you need to know something more? Do you have any hint? 
Could it be an Evolution problem (maybe the old Evolution 3.18.5.2 or a
new feature in the newer version)?
Or is it rather a email server problem?

Thanks in advance

Dan