Painted Landscapes have blacked out sections when deployed to a mobile device

If a user uses a multi layered material to pain a landscape and then deploys this project to an iPhone 6 plus our an Android Samsung Galaxy Note3 (SM-N9005) parts of the landscape will appear to be solid black.

Additional User URL:
https://answers.unrealengine.com/questions/197635/46-to-47-rendering-issues-on-ios.html

1. Download Attached project
2. Open Project
3. Launch on to an iPhone 6 Plus
4. Navigate the character so that the whole landscape can be seen
5. Notice there are black sections in the landscape (No black was used)