How to reproduce:
1. Open the attached "TextLoaderTest" project and "Main" scene
2. Enter playmode while on Standalone platform, observe both Spheres and that their illuminated the same
3. Change to iOS/Android platform
4. Enter playmode

Expected result - Both Spheres are illuminated the same
Actual result - Sphere that has its normal map texture loaded from Asset Bundle has its shading incorrect, is not illuminated like the Sphere that has its normal texture set directly from Assets

Reproducible with - 2018.1.0a1, 2017.3.0a5, 2017.2.0f3, 2017.1.2p1, 2017.1.0a1

Note: If building the same "Moon02" texture to Asset Bundle with BuildTarget.Android (or other mobile platform) and switching to Standalone, the same bug persists (only on NVIDIA). This bug seems to happen ONLY when switching from Standalone to Mobile platforms or vice versa. It did not occur when changing to WebGL or Universal Windows Platform

Workaround: Delete the asset bundle file, that was created while working in previous platform and create a new one