creating new mailbox in Mail doesn't work
(a)When I create a new mailbox (NMB) in Mail (OS 12.6.5) it appears in the list of mailboxes in the chosen location, but (1) Any email moved to NMB simply disappears (2) an email copied to NMB does not appear in it.
(b) I still have the old problem that downloaded maul cannot be displayed for up to several minutes. Rebuilding etc. has no effect
iMac 27″, macOS 12.6