Prerequisites:
Samsung Galaxy S7 Edge device with ARM Mali GPU.

Steps to repro:

1. Open attached project and 'TestScene' scene;
2. Build and run the scene on Android under Vulkan API.

Expected result:
Terrain meshes are rendered on Android under Vulkan. See expected.png screenshot.

Actual result:
Terrain meshes are not rendered on Android under Vulkan. See actual.png screenshot.

Notes:
- Reproducible in 2018.1.0a5. 2017.3.0b10, 2017.2.0p1;
- Not reproducible in Windows Standalone player;
- Not reproducible on Samsung Galaxy S7 Edge with Adreno GPU;
- The behaviour differs when using instanced and non-instanced meshes: with instanced mesh nothing is rendered on Android Vulkan, while with non-instanced mesh only part of the meshes (but not all of them) are rendered.