Steps to reproduce:
1. Open attached project
2. Build & Run to an Android device

Expected result: VideoPlayer videos should be working with transparency on older Android versions

Reproduced in: 2019.1.0a12, 2017.4.13f1

Tested devices:
Reproduced in:
VLNQA00105, Htc One X (HTC One X), Android 4.2.2, CPU: nVIDIA Tegra 3 AP33, GPU: NVIDIA AP
VLNQA00030, Lge LG G2 (LG-D802), Android 4.4.2, CPU: Snapdragon 800 MSM8974, GPU: Adreno (TM) 330
N/A, Htc Desire 510 (HTC Desire 510), Android 4.4.3, CPU: Snapdragon 410 MSM8916, GPU: Adreno (TM) 306
VLNQA00053, Asus Nexus 7 (2012) (Nexus 7), Android 5.1.1, CPU: nVIDIA Tegra 3 T30L, GPU: NVIDIA Tegra 3 - crashes after few seconds
Not reproduced in:
VLNQA00051, Xiaomi MI MAX (MI MAX), Android 6.0.1, CPU: Snapdragon 617 MSM8952, GPU: Adreno (TM) 510
VLNQA00031, Lge Nexus 5 (Nexus 5), Android 6.0.1, CPU: Snapdragon 800 MSM8974, GPU: Adreno (TM) 330
VLNQA00153, Google Pixel XL (Pixel XL), Android 9, CPU: Snapdragon 821 MSM8996 Pro, GPU: Adreno (TM) 530
N/A, Sony Xperia Z2, Android 8.1.0, CPU: Snapdragon 801 MSM8974PRO-AB, GPU: Adreno (TM) 330
VLNQA00087, Sony Xperia Z2 Tablet (SGP511), Android 6.0.1, CPU: Snapdragon 801 MSM8974PRO-AB, GPU: Adreno (TM) 330