Unread messages not displaying in All Inboxes
In the last day or two unread messages in individual mail accounts have stopped displaying when selecting All Inboxes in Apple Mail. They display properly in the individual mail accounts.
I have not (knowingly) changed mail preferences or had any software updates.
Google search has not found any similar problems.
Monterey 12.0.1
Mail 15.0
iMac 27″, macOS 10.12