After update, app crashes after loading any world created in an earlier version of MCPE.

Upgraded from 0.12.x to 0.13.x on IOS9.1 (iPad Mini). After starting the game, attempting to open a world that was created in a previous version (0.12.x) crashes within a second of the world loading. Happens on every world we had created in the prior version.

The app closes completely.