Walk into lava bug

When I walk into lava the screen is white.
What I expected to happen was...:
Appear fire

What actually happened was...:
Appear white...

Steps to Reproduce:
1. Open Minecraft PE on your Apple Device
2. Create a world in Creative
3. Put lava on the dirt and try to walk into lava
4. If screen appear white restart the game and everything back to normal.