Hey,

If you create a comment in JIRA using apples emojis, your comment will not save.
In the logs you get an error:
[jira.rest.exception.ExceptionInterceptor] Returning internal server error in response
java.lang.reflect.InvocationTargetException

There you can see, that the emoji is like "😀".

Please fix this error. Using an emoji should not break the whole comment. Just delete this "foreign characters" or replace them with some characters. For example: Outlook replaces the emojis with normal a-z characters.