Emojis in post titles are not rendered in invite to topic emails. They should probably simply be escaped when rendering the email.
I suppose this is basically the same issue as has been reported here years ago here so that it might be worth checkking all email templates for similar issues.
There are a number of places where we have seriously regressed on converting text emoji to Unicode emoji cc @techAPJ I also noticed this in recent email summaries @neil.
I made a fix for topic titles in emails today. I thought we were already doing it, but it doesn’t look like it…
I just pushed a fix that will render emoji in topic title on “topic unsubscribe” page and google crawler (JavaScript disabled) version.
Pushed a fix to render unicode emoji in title tag on topic page:
https://github.com/discourse/discourse/commit/1c1b36ad143978a28cf9e4c6ac1a7422a0d09e99
Closing this topic now. Feel free to flag this post if anyone notice any more oddity in emoji rendering.