Thanks, I have never tried to have any emoji in a title so I would have never noticed that.
The emoji picker is not activated in the title input when a topic is created. Yet it is activated in the title edit input. For example, if you click the edit pencil icon next to the topic title and start typing a colon, the emoji picker will display.
Although I have reservations about expecting Discourse to map all non-supported emoji codepoints to supported codepoints just so browsers won’t display buggy titles, I do think it would be good to have the emoji picker activate during topic creation.
Edge case and low priority perhaps, but an inconsistency nonetheless.