Visual artifacts appear when a Terrain has "Draw Instanced" enabled

How to reproduce:
1. Open the user’s attached “TerrainTest.zip“ project
2. Build and Run for Android
3. Walk with the character using a joystick on the screen

Expected result: There are no visual artifacts
Actual result: Some flickering of the terrain or the background can be seen

Reproducible with: 2020.3.40f1, 2021.3.12f1, 2022.1.20f1, 2022.2.0b11, 2023.1.0a13
Not reproducible with: 2020.3.40f1

Reproducible with these devices:
Samsung Galaxy Z Flip3 5G (SM-F711B), Android 12, CPU: Snapdragon 888, GPU: Adreno (TM) 660
Qualcomm (SDM845 for arm64), Android 8.1.0, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630
Oneplus OnePlus 7 Pro (GM1913), Android 11, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640
Qualcomm (SDM845 for arm64), Android 8.1.0, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630
Samsung S10 (Adreno 640) (user’s information)
S20 (Adreno 650) (user’s information)
S21 (Adreno 660) (user’s information)

Google Pixel 4

 

Not reproducible with these devices:
Samsung Galaxy S22 (SM-S901B), Android 12, CPU: Exynos 2200, GPU: Ltd.
VLNQA00494 - iPhone 14 Pro Max, 16.0 iOS
VLNQA00358 - iPhone 12, 14.1 iOS
VLNQA00392 - iPad (9th generation), 15.0 iOS
VLNQA00310 - iPad Pro 12.9", 13.4.1 iOS

Couldn’t test with these devices:
Samsung Galaxy S10+ (SM-G975F), Android 10, CPU: NOT FOUND, GPU: Mali-G76 (application crashes)
Huawei - (ELS-NX9), Android 10, CPU: HiSilicon Kirin 990 5G, GPU: Mali-G76 (application crashes)

Reproducible with: Vulkan and OpenGLES3 Graphics API’s

Not reproducible with: Windows Standalone

Note: It’s not 100% a regression, since reproduction is not consistent, but nonetheless I was unable to reproduce the issue on 2020.3.40f1: UPDATE (tim.aidley) I was able to reproduce this on 2020.3.40f1 on a Pixel 4.