How to reproduce:
1. Open the “ReproProject“ project
2. Open the “ShadowTest“ scene
3. Build and Run for Android
4. Wait for a few seconds for the “Sphere (Clone)“ GameObject to instantiate
5. Observe the shadows

Expected result: The shadow cast by the “Sphere (Clone)“ GameObject is visible
Actual result: No shadow is visible

Reproducible with: 2022.3.53f1, 6000.0.29f1, 6000.1.0a6
Could not test with: 2021.3.46f1 (“Shader error in '<custom_shader_name>': undeclared identifier 'sampler_LinearClampCompare'“)

Reproducible environment: macOS 14.6.1 (Intel)
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
VLNQA00423, Google Pixel 3 (Pixel 3), Android 9, CPU: Snapdragon 845, GPU: Adreno (TM) 630

Not reproducible with these devices:
VLNQA00335, Samsung Galaxy S20+ 5G (SM-G986B), Android 10, CPU: Exynos 990, GPU: Mali-G77
VLNQA00511, Samsung Galaxy S8 (SM-G950F), Android 9, CPU: Exynos 9 Octa 8895, GPU: Mali-G71
VLNQA00526, Samsung Galaxy A12 (SM-A125F), Android 12, CPU: MediaTek Helio P35 (MT6765), GPU: PowerVR Rogue GE8320
VLNQA00178, Xiaomi Redmi Note 4 (Redmi Note 4), Android 6.0, CPU: MediaTek Helio X20 MT6797M, GPU: Mali-T880
VLNQA00363, Samsung Galaxy Z Fold2 5G (SM-F916B), Android 12, CPU: Snapdragon 865 SM8250, GPU: Adreno (TM) 650
VLNQA00278, Xiaomi - (Redmi Note 7), Android 10, CPU: Snapdragon 660, GPU: Adreno (TM) 512

Could not test with these devices:
VLNQA00107, Huawei Nexus 6P (Nexus 6P), Android 8.1.0, CPU: Snapdragon 810 MSM8994, GPU: Adreno (TM) 430 (APK in the device does not open)
VLNQA00535, iPhone XS (MT9F2ET/A), CPU: Apple A12 Bionic, GPU: Apple designed, OS: 17.6.1 (No shadows appear with both “SAMPLE_TEXTURE2D_SHADOW“ and “SAMPLE_TEXTURE2D“)
VLNQA00416, iPhone 13 Pro (MLVA3ET/A), CPU: Apple A15 Bionic, GPU: Apple designed, OS: 16.1.1 (No shadows appear with both “SAMPLE_TEXTURE2D_SHADOW“ and “SAMPLE_TEXTURE2D“)

Workaround: Instead of “SAMPLE_TEXTURE2D_SHADOW(textureName, samplerName, coord3)“ use “SAMPLE_TEXTURE2D(textureName, samplerName, coord2)“ in the shader for manual comparison. Can be observed in the “ReproProject“ project, when the “switch shadow“ button is pressed

Notes:
- Could not test with the Editor and the Standalone build, the “Sphere(Clone)“ GameObject does not instantiate
- Only reproduces if the shadow caster, the “Sphere (Clone)“ is instantiated manually, if the “Sphere“ prefab is added to the scene, the shadows appear when using “SAMPLE_TEXTURE2D_SHADOW“
- Reproduces with both OpenGLES3 and Vulkan Graphic API’s