Yes I use StageTextTextEditor. I'm saving on a server database, but I also tried to load locally. On Mac OS and browser it displays correctly, I don't think it is an encoding issue. On Android it is displayed as a blank character. When I put the cursor next to that character the cursor splits.
I also tried as below.
input.text = "Testing emoji \uD83D\uDE00";
The strange thing is I can input emoji characters, but can not display them back on Android.