This is kinda hard to explain so I'll do the best I can to get the issue across. Before the latest update you would be shown the sign on screen and could go to different lines for example, but now it only shows the Xbox popup keyboard with a small built-in text box above it. When I press enter, which would normally let me go to the next sign line, it just closes the textbox/keyboard.

This bug also affects the command system as well. You can't use the autofill or see co-ordinate suggestions or any of the old features - now it's just replaced by the keyboard/textbox thingy (there's probably a proper name for it but that's what I'm going with).

Anyway, if this is just a simple thing I can change in settings or if it genuinely is a bug a fix is definitely needed soon because this is just a really annoying thing to deal with. If you need more information or screenshots of what it looks like compared to before I'm willing to send them.

How to reproduce 
1) Place sign/open command prompt on Xbox.
2) Type.

Expected Outcome
Not the weird textbox/keyboard prompt.

Actual Outcome
The weird textbox/keyboard prompt.