I can't exit out of the chat window, I have to close the game.  I've tried pressing the back button, and just randomly pressing everything, nothing can get me out of this menu. 
Screenshot:

How to reproduce:
1. Open Minecraft on Xbox One
2. Launch World.
3. Open Chat Menu.

Please, if anyone else has an Xbox One, (Or, even more specifically, an Xbox One S), could they please try to open the Chat Menu and see if this problem happens to them, or if (hopefully it's not) it's just me.