Texture loading problem in Minecraft PE version 1.9.0. 

Steps to recreate glitch:

1) Create new world

2) turn off all texture packs and disable expiramental gameplay

3) Select Create

4) Lock iPhone after 2-3 seconds, then unlock

5) you will still be in Minecraft, world will resume loading, but textures will not

6) After loading completion,  world will load successfully, but textures will be in the purple- black state, for unknown blocks or missing textures

7) Repeat steps 4-6 and the texture will show as glitched models