Reproduction steps:
1. Open customer's attached project in "MiniDayZ2_MetalBug copy.zip"
2. Build for iOS and deploy it to iOS application

Unexpected behaviour: everything is rendered black (read the notes below)

Not reproducible with OpenGL ES 3 (Could not test with OpenGL ES 2 because of errors in Unity)

Reproducible with: 2019.4.10f1, 2020.1.4f1, 2020.2.0b2
Could not test with 2018.4 because couldn't resolve errors in Unity

Tested devices:
Reproducible with:
VLNQA00310 iPad Pro 12.9 1st gen (iOS 13.4.1)
iPhone XR (iOS 13.4.1)
iPad 9.7 6th gen (iOS 14.0b7)
Not reproducible with:
iPad Air 2 (iOS 11.0.3)
iPhone 8+ (iOS 12.0)

Notes:
1. Sometimes minimizing and maximizing the application resolves the issue
2. The customer mentioned that if the issue does not instantly reproduce tapping and rotating the screen may cause the issue to reproduce