LOL!  It was the 😂 emoji that broke nostr:npub10wktsrm8fxwp0gyjutjalesgqt9vxuw6xx09xrx49zwu4kq24uzqdy366x !  Multi-codepoint #utf8 strikes again!

https://files.mastodon.online/media_attachments/files/111/178/834/982/960/454/original/0295effeadc1611d.png