Reproduction steps:
1. Open "VulcanAndroidBug.zip" project
2. Build & Run for Android
3. Notice that "Blend One Zero" and "Implicit" have dark rendering artifacts compared to the other models

Actual Result: Models rendered with "Blend One Zero" or an implicit blend mode render with artifacts on Vulkan Graphics API

Reproduced with: 2020.1.0a9, 2019.3.0b8, 2019.2.10f1, 2018.4.12f1, 2017.4.33f1

Reproduces with: Vulkan; Mono; .NET 2.0 and .NET 4.x
Doesn't Reproduce with: OpenGLES2, OpenGLES3; IL2CPP (Crashes on Start)

Repro Devices:
VLNQA00147, Razer Razer Phone (Phone), Android 8.1.0, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00277, Asus ROG Phone (ASUS_Z01QD), Android 8.1.0, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630
VLNQA00139, Vivo Xplay6 (vivo Xplay6), Android 7.1.1, CPU: Snapdragon 820 MSM8996, GPU: Adreno (TM) 530
VLNQA00173, Xiaomi Redmi 6 Pro (Redmi 6 Pro), Android 9, CPU: Snapdragon 625 MSM8953, GPU: Adreno (TM) 506
VLNQA00124, Google Pixel 2 XL (Pixel 2 XL), Android 9, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00010, Samsung Galaxy S8 (SM-G950U), Android 7.0, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00015, Samsung Galaxy Note8 (SM-N950W), Android 8.0.0, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00262, Sony Xperia XZ Premium (G8141), Android 9, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00146, Htc 10 (HTC 10), Android 7.0, CPU: Snapdragon 820 MSM8996, GPU: Adreno (TM) 530

No Repro Devices:
VLNQA00121, Samsung Galaxy S9 (SM-G960F), Android 9, CPU: Exynos 9 Series 9810, GPU: Mali-G72