I have see repeat odd behavior a couple of times (even different versions) where I can archive email from Apple Mail to a database (named Mails, in my case) and sometimes it creates another “Apple Mail” group and archives new mail in that new group with the same sub-group for mailbox folders.
I just copy the ‘new’ email items to the previous set of folders. That may be a problem, I have not used a duplicates smart group.
Is this a known issue and is there a fix?
Lee