According to the protocol guidelines🧐, it's nostrudel that's wrong

nostr:nevent1qqs8x434ec5whvyh5chxh08s66af7g2p3f0xxj04t8n6rggekpcwejgpz3mhxue69uhhyetvv9ujuerpd46hxtnfdupzq3svyhng9ld8sv44950j957j9vchdktj7cxumsep9mvvjthc2pjuqvzqqqqqqy7e2qzc

What happens is that it doesn't add the : (as in the image) so the other clients that follow the protocol don't identify it as an emoji