[Evolution] Evolution 3.30.5-1.1 trashing emails seemingly at random

[Al <awgnome sunnyside com>]

Evolution apparently is being triggered to Trash (i.e. move to the Trash 
folder) some of my emails.  If I move them back to the Inbox, they get 
Trashed again.

My Evolution client (Debian package manager says it is version 
3.30.5-1.1) on one Debian 10.7 (fully updated) machine has three 
accounts open, and it exhibits this behavior on all three accounts. Some 
email must get matched to something, somehow and get sent to Trash.  I 
don't see any pattern in particular.  Whatever the bug is in matching 
what emails to (erroneously) trash, it's repeatable.  If I move them 
back to Inbox, those and only those emails are almost immediately 
trashed again.

Since there are many IMAP clients, and I wanted to be sure who to blame, 
I created special Trash subfolders.
The subfolders are named server.client, and the email right away stopped 
getting sent to Trash and instead started showing up in HADRON.ev (the 
host name is hadron, and ev for evolution, instead of, e.g. tb for 
Thunderbird).

I haven't dived into the code, but of course I have gone over my 
settings.  For one thing, these emails are not getting put in Junk, and 
I have always had junk filters off anyway.  I don't know of any feature 
in Evolution that would trash email without being requested.  I don't 
have any filters on and the 'filter' feature is disabled.   The emails 
that are getting caught are seemingly very diverse, with no obvious pattern.

Why would Evolution send email to Trash anyway?  Is it possible there is 
some sort of "duplicate" detection that trashes some of the email?  I'm 
grasping at straws here.

Can anyone suggest a place to start looking?  Is there a verbose log I 
can configure?

I should add that this problem has been going on for at least a year or 
two and likely on several Evolution versions during that time, since I 
do periodic updates of the system.  I doubt that it's a brief flaw in 
only the current version.