When I post a tweet with all emojis and a link the URL range is calculated incorrectly, which leads to a gibberish push notification (i.e., the t.co hash overlaps part of the correct push text). I have observed this on iOS by posting a tweet manually as below or sending one via the REST API.
Here is an example:
.@TheBealDeal 🏈💯🏈💯🏈💯🏈💯🏈 #FIREFIRE http://firefire.wtf/thebealdeal