Steps to reproduce:
1. Open "LWRP Terrain" attached project
2. Make sure Graphics API is set to GLES 3
2. Build and run Terrain Scene on device
3. Observe terrain not matching the editor, huge part of it missing

Expected: Terrain should be visible like it is in the editor
Actual: Huge chunk of terrain is not rendered

Reproduced on:
2019.3.0a3

Repro: LWRP Package version: 6.5.3 ; 5.16.1 ; 5.13.0
No Repro: LWRP Package version 5.7.2 ; 5.10.0

Devices Under Test:
Repro (GLES3):
VLNQA00096, Samsung Galaxy S8 (SM-G950F), Android 8.0.0, CPU: Exynos 9 Octa 8895, GPU: Mali-G71
N/A, Samsung Galaxy S7 (SM-G930F), Android 7.0, CPU: Exynos 8 Octa 8890, GPU: Mali-T880
VLNQA00233, Meizu - (PRO 6 Plus), Android 7.0.0, CPU: Exynos 8 Octa 8890, GPU: Mali-T880
VLNQA00166, Huawei P20 (EML-L29), Android 8.1.0, CPU: HiSilicon Kirin 970, GPU: Mali-G72

HELA0167, iPad 6th gen, SoC: A10 , iOS: 11.4.1
VLNQA00157, iPhone X, SoC: A11, iOS: 12.2

No Repro(GLES3):
VLNQA00216, Razer Phone 2 (Phone 2), Android 8.1.0, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630
VLNQA00123, Google Pixel 2 XL (Pixel 2 XL), Android 9, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00230, Oneplus OnePlus6T (ONEPLUS A6013), Android 9, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630
VLNQA00010, Samsung Galaxy S8 (SM-G950U), Android 7.0, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00017, Huawei Nexus 6P (Nexus 6P), Android 8.0.0, CPU: Snapdragon 810 MSM8994, GPU: Adreno (TM) 430
VLNQA00173, Xiaomi Redmi 6 Pro (Redmi 6 Pro), Android 9, CPU: Snapdragon 625 MSM8953, GPU: Adreno (TM) 506

NOTE:
Metal and Vulkan render terrain as expected