Turns out this a bug in Chrome not in Discourse. It works in Firefox and Safari
I see similar topics but I’m not sure this is the same thing.
I put real unicode emoji in the topic name (not funky discourse implemented emoji). They show in the list of topics but they don’t show up at the top of the topic itself. Is that the same bug as discourse emoji?
To be clear here’s the this topic on the front topic list
And here you can see at the top the emoji are missing