This would be a good test case for nostr:npub1pages5yhmncmmfxuza9f9fx68fju0nxnewtlffzrapsufax5mv0sznuw9d — would most, if not all, those npubs resolve to their respective usernames if you added it?
I assume most (but not all) because I have it in my relay list and there are still some that display that way. It can’t be small accounts either because one of them is nostr:npub1jg552aulj07skd6e7y2hu0vl5g8nl5jvfw8jhn6jpjk0vjd0waksvl6n8n — this issue is only in #Damus tho so likely a client thing.
nostr:note1w86p300vnupsna89crxnj8zfh8fgqlun7ux2awy2t8y4vq8e7khqxyjsks