How to reproduce:
1. Open the attached “IN-120078.zip” Project
2. Build and Run with the “MasterLightingScene” and “AdditiveScene” added in the Scene List
3. Press the “Load Additive Scene” Button in the Player
4. Observe the Cube

Expected result: Cube casts a shadow
Actual result: No Shadows are appearing

Reproducible with: 2023.3.0a7, 6000.0.62f1, 6000.2.12f1, 6000.3.0f1, 6000.4.0a5, 6000.5.0a1
Not reproducible with: 2022.3.69f1, 2023.3.0a6

Reproducible on:
macOS 26.0.1 (M3 Pro) - Standalone Player
VLNQA00598 - samsung Galaxy Fold (SM-F900F), CPU: Snapdragon 855 SM8150, GPU: Adreno 640, OS: 9
VLNQA00591 - samsung Galaxy S23 (SM-S911B), CPU: Snapdragon 8 Gen 2 (SM8550), GPU: Adreno 740, OS: 14
VLNQA00566 - samsung Galaxy S8 (SM-G950F), CPU: Exynos 9 Octa 8895, GPU: Mali-G71, OS: 9
VLNQA00411 - Galaxy Z Fold3 5G (SM-F926B), CPU: Snapdragon 888, GPU: Adreno 660, OS: 11
VLNQA00374 - Galaxy S21 Plus 5G (SM-G996U), CPU: Snapdragon 888, GPU: Adreno 660, OS: 11
VLNQA00151 - Samsung Galaxy S9 (USA) (SM-G960U), CPU: Snapdragon 845 SDM845, GPU: Adreno 630, OS: 10
OnePlus Nord CE (reporters)
OnePlus 6T (users)
iPhone 16 Pro Max (reporters)

Notes:
- Not reproducible in Editor
- Project zip has multiple folder for each stream, open relevant one when checking for faster upgrading Editor Version process