Mail app Inbox not updating and unread indicators persist

Two problems all of a sudden:

1. Mail.app has stopped showing new messages in the Inbox without first clicking another mailbox/folder and clicking back to the Inbox. The display of the message list does not update to show the new messages in the list. The unread Inbox count number displays correctly, but the actual messages don't show up until I click somewhere else and then return to the Inbox.
2. The "unread" dot for new messages is not disappearing after the message has been read/opened. The unread count updates correctly, but the unread indicator remains visible.

Anyone else experiencing these two display anomalies?

Tahoe 26.6.2