Steps to reproduce:
1. Open user's attached project "TerrainInstancingBug.zip"
2. Build it on Android
3. Notice the Terrain is Rendered black

Expected results: Terrain is Rendered Blue and Green
Actual results: Terrain is Rendered black

Workaround 1: Customer is adding a terrain instance to the scene but disabling it to workaround this issue. See 'Workaround' scene.
Workaround 2: Using the BuiltInLegacyDiffuse shader with Terrain (set via Terrain.materialType) also works.

Reproducible with: 2018.4.17f, 2019.3.1f1, 2020.1.0a24

VLNQA00091, Google Pixel 2 XL (Pixel 2 XL), Android 10, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00153, Google Pixel XL (Pixel XL), Android 10, CPU: Snapdragon 821 MSM8996 Pro, GPU: Adreno (TM) 530
VLNQA00173, Xiaomi Redmi 6 Pro (Redmi 6 Pro), Android 9, CPU: Snapdragon 625 MSM8953, GPU: Adreno (TM) 506
VLNQA00024, Xiaomi Mi 5 (MI 5), Android 7.0, CPU: Snapdragon 820 MSM8996, GPU: Adreno (TM) 530

Not Reproducible with:
VLNQA00315, Samsung Galaxy Note10 (SM-N970U), Android 9, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640
VLNQA00138, Huawei P20 Pro (CLT-L29), Android 8.1.0, CPU: HiSilicon Kirin 970, GPU: Mali-G72
VLNQA00325, Samsung Galaxy Note10 (SM-N970F), Android 9, CPU: Exynos 9 Series 9825, GPU: Mali-G76

Note: Reproduces with Vulkan and OpenGles3 and OpenGles2. Unable to test with 2017.4 due to Terrain Layer does not exist in 2017.4