Junk mail duplicated mails from my entire inbox

SPPApple wrote:

Big Sur 11.6 upgrade completed, but one entire IMAP email inbox has been replicated and marked junk including some of the properly filtered junk messages from applied rules. Has anyone seen this, guessing this is a bug? I had prior to the last update reinstalled my mail servers from scratch but duplication occurred after the update, correlation or causation? I have several mail accounts that are not experiencing this problem including the second IMAP email account making me wonder if I have inadvertently set something wrong. Any help from much wiser heads is appreciated.

Note: in the time it took me to write this, the junk mails vanished, without restarting mail or adjusting any settings. Any one else have this happen? So peculiar!

You can file a bug report through the same link here: Apple Feedback http://www.apple.com/feedback

Problematic email accounts resolved through deleting the accoint and adding it back in:

Add or remove email accounts in Mail on Mac - Apple Support

Junk mail not working

https://support.apple.com/guide/mail/if-junk-mail-filters-arent-working-mlhlp1145/mac

https://support.apple.com/guide/mail/junk-mail-preferences-cpmlprefjunk/mac

https://support.apple.com/guide/mail/reduce-junk-mail-mlhlp1065/mac

Identify and filter junk mail in iCloud - Apple Support

https://support.apple.com/en-in/guide/mail/junk-mail-advanced-settings-cpmlprefjunkadd/mac

https://support.apple.com/en-in/guide/mail/viewing-preferences-cpmlprefview/mac

Mail advanced junk mail settings on Mac - Apple Support

https://support.apple.com/en-in/guide/mail/junk-mail-advanced-settings-cpmlprefjunkadd/mac