Grass blocks are corrupted when quitting MCPE without quitting to title

The corrupted world stays corrupted even after a reboot. All new worlds created after this event are corrupted from the start. A reboot of the device cures the problem for new worlds created after the reboot, but pre-existing corrupted worlds remain corrupted.

How to reproduce:
Open a new world in creative
Hit the Kindle menu tab (two lines on right of screen)
Hit the home button - reverts to the Kindle carousel
Tap the Minecraft icon to get back into the world
Grass blocks now corrupted, see snapshot.

Also occurs when:
Open a new world in survival
Hit the Kindle menu tab (two lines on right of screen)
Hit the back arrow to show Game Menu
Hit the Kindle menu tab again (two lines on right of screen)
Hit the home button - reverts to the Kindle carousel
Tap the Minecraft icon to get back into the world
Grass blocks now corrupted.

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