Very interesting. I will need to see where they got that emoji from.
Discussion
So these are using I think NIP-30 emoji reactions. I made a pack on emojito.meme and I reacted to your earlier reply with one on Nostrudel, and on Amethyst it's just a 'j' when it should be the one I'm about to react with to you here on Amethyst.
Hum.. custom emojis are supposed to start with : maybe they missed this on their implementation 🤔
It was a choice of implementation, in the reactions, despite being able to have any text, by default it is not expected to have anything other than the reaction in the content field so they judged the identification with : unnecessary.
Wrong call, though. The reactions NIP clearly requires the :: https://github.com/nostr-protocol/nips/blob/master/25.md
I think I was talking nonsense and they must have forgotten to add it. There have also been other emoji-related errors recently