Golden gate / Mail - smart mailbox stopped working

For many years, I’ve had a smart mailbox which contains most of my unread messages. I’ve just installed Golden Gate (latest version) and it’s stopped working: it’s always empty. Here’s a screenshot of the setting.

Any ideas?

I’ve tried creating a new smart mailbox whose only criterion is “message is unread”. That one remains resolutely empty as well, although I have a dozen or so unread messages scattered around various mailboxes. Selecting iCloud “Inbox” and filtering by unread works. Jolly odd.

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