nostr:npub18493n5t4cv7hl2mjh67pzkjweg386f97knkrztnty6a7r67cg62s42rw42 yes so presumably I have to put both the excerpt AND the tags into that box, which I've already set elsewhere

Which is the bit that I find frustrating as the text is already in existing fields that Wordpress can read. I shouldn't need to copy stuff between fields.