As stated above, the bug will make the backspace button move the line back by one, without removing the letter.

Steps to reproduce bug:

1.) Open the app entitled "Minecraft PE" in version 0.13.0 Alpha. If the version in the bottom left corner of the screen does not match, then update the version of the app.

2.) Select the "Play" button. It's point-blank in the middle of the screen, you can't miss it.

3.) Click the "New" button in the top right corner of the screen. Click the bar with the name and when the renaming screen appears, press backspace.

An update would be much obliged.
Thank you for your time.