Reproduction steps:
1. Open attached project
2. Build Android player and run on Samsung Galaxy S7 with Graphics API set to OpenGLES3
3. Observe color
4. Change Graphics APIs to Vulkan and run on Samsung Galaxy S7
5. Observe color

Expected: Color rendered in Step 3 and Step 5 should be same
Actual: Color rendered in Step 3 is darker than color rendered in Step 5 significantly

Reproducible with: 2019.1.0a6, 2018.3.3f1, 2018.3.2f1, 2018.2.20f1
No repro: 2017.4.19f1
Does not reproduced anymore in: 2019.1.0a15, 2019.1.0a7

Tested devices:
Reproduced with:
VLNQA00006, Samsung Galaxy S7 (SM-G930F), Android 8.0.0, CPU: Exynos 8 Octa 8890, GPU: Mali-T880
VLNQA00136, Samsung Galaxy S9+ (SM-G965F), Android 8.0.0, CPU: Exynos 9 Series 9810, GPU: Mali-G72
Not reproduced:
VLNQA00021, Samsung Galaxy S7 (SM-G930F), Android 7.0, CPU: Exynos 8 Octa 8890, GPU: Mali-T880
VLNQA00216, Razer Phone 2 (Phone 2), Android 8.1.0, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630
N/A, Xiaomi POCO F1 (POCOPHONE F1), Android 9, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630
VLNQA00125, Google Pixel 2 (Pixel 2), Android 8.1.0, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
Not reproduced:
VLNQA00203, iPad Pro 10.5, with Metal API ios version (10.3.3)
Application crashes:
VLNQA00101, Samsung Galaxy Note8 (SM-N950U), Android 8.0.0, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00257, Sony Xperia XZ Premium (G8141), Android 8.0.0, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540