How to reproduce:
1. Open the “WebGLLightCookie.zip“ project
2. Open the “LightCookie_Sample“ scene
3. Build for WebGL
4. Start a local server in the directory where the WebGL build is (“python3 -m http.server“)
5. Open the WebGL build on a browser on Android (“https://<YOUR IP ADDRESS:8000>“)
6. Observe the grey square

Expected result: The checkmark is rendered
Actual result: The checkmark is not rendered 

Reproducible with: 2022.3.60f1, 6000.0.43f1, 6000.1.0a5
Not reproducible with: 6000.1.0b11, 6000.2.0a7
Fixed in: 6000.1.0a6

Reproducible environment: macOS 15.3.1  (M4 Max), Windows 11 (Reporters)
Not reproducible environment: No other environment tested

Reproducible with these devices:
VLNQA00518, Google Pixel 4 (Pixel 4), Android 13, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640
VLNQA00107, Huawei Nexus 6P (Nexus 6P), Android 8.1.0, CPU: Snapdragon 810 MSM8994, GPU: Adreno (TM) 430
VLNQA00368, Samsung Galaxy Z Fold2 5G (SM-F916B), Android 11, CPU: Snapdragon 865 SM8250, GPU: Adreno (TM) 650
Samsung Galaxy Tab S7, GPU: Adreno 650 (Reporters)

Not reproducible with these devices:
VLNQA00511, Samsung Galaxy S8 (SM-G950F), Android 9, CPU: Exynos 9 Octa 8895, GPU: Mali-G71
VLNQA00335, Samsung Galaxy S20+ 5G (SM-G986B), Android 10, CPU: Exynos 990, GPU: Mali-G77
VLNQA00510, Lenovo Lenovo Tab M10 HD (2nd Gen) (Lenovo TB-X306F), Android 10, CPU: Mediatek MT8768, GPU: PowerVR Rogue GE8320
VLNQA00626, iPhone 16 (MYE73QN/A), CPU: Apple A18 Pro, GPU: Apple designed, OS: 18.3.1

Notes:
- More information in the comments
- Not reproducible on Desktop browsers