Not sure if it was 9805 or 9807, but aliases no longer seem to work.

10:16:08.167 [20251065] alias:abuse@mydomain.com is an alias. Expanding recipient list.
10:16:08.169 [20251065] Delivery started for me@mydomain at 10:16:08 AM
10:16:08.169 [20251065] Removing Spool message: Killed: False, Failed: False, Finished: True
10:16:08.169 [20251065] Failed to generate bounce message for empty alias.
10:16:08.169 [20251065] Delivery finished for me@mydomain.com at 10:16:08 AM    [id:20251065]