Steps to reproduce:
1. Open the attached “IN_135053_My project (3).zip” project
2. Open the “SampleScene” scene
3. Switch the build target to “Android”
4. Observe the Scene View

Alternative steps to reproduce:
1. Create a new project
2. Import the attached “textures_for_repro” asset package
3. Create a Terrain (3D Object → Terrain)
4. In the Inspector, navigate to the “Terrain” component
5. Open the “Paint Terrain” tab
6. Create a Terrain Layer
7. Set “Diffuse” and “Normal Map” to the attached textures of your choice
8. Disable the “Directional Light” GameObject in the Hierarchy
9. Open the Lighting window (Window → Rendering → Lighting)
10. Open the “Environment” tab
11. Under “Environment Lighting” switch the Source to “Gradient”
12. Adjust the “Sky Color” so the terrain is more easily visible
13. Switch to Android build target (File → Build Profiles)
14. Observe the Scene View window

Actual result: Terrain diffuse becomes black in viewport
Expected result: Terrain layer color is the same as it is in build target "Windows” or “Mac”

Reproducible with: 2023.3.0b8, 6000.0.68f1, 6000.3.10f1, 6000.4.0b10, 6000.5.0a7
Not reproducible with: 2023.3.0b7

Reproducible on: macOS Sequoia 15.7.3 (M1 Max), Windows 11 (User Reported)
Not reproducible on: No other environments tested

Note: Issue reproduces in Player