I have no idea how long its been in the game because it was hard to find. Heres what you need to do to recreate the bug. First off, click on single player worlds button (do not enter any worlds!). Step two requires that you have enough worlds to cause there to a be a scroll bar on the right side of the screen. If you have a scroll bar, scroll it to the very bottom of the screen, then search anything in the search bar that 3 or more of your worlds are named, and watch as the the scroll bar rapidly vanishes off screen making it impossible to scroll up again without clearing the search bar.
 
 

[{_}7:46 PM{_}]
java btw