are njump links supposed to generate previews ? Never seems to work for me. nostr:npub1uvl7vhclmezvdhqha6eclkksln40rjhgwgsggvew683jf93fr4pq3mq3sd mentioned they need to be fast to render or else they won’t show up. Is that the issue? I am going to take a stab at building something like njump for damus links. Will use nostrdb and rust.