When loading a scene from an asset bundle containing a terrain; Where the terrain textures are contained within another AssetBundle. The terrain is rendered completely black. Thus preventing the use of shared textures within AssetBundles across many terrains. Unless they are all contained in the same AssetBundle.
This makes scalability when using large terrains very difficult.

Steps to reproduce (using User's attached project):

Observe it works fine in the editor:
1. Run "main" scene
2. Click either button at the top of the game view.
3. Observe that the terrains are displayed correctly.

To observe it breaks in the Player:
1. Build for OSX/Windows
2. Click either button at the top of the game view.
3. Observe that the terrain A, is completely black.

Reproduced with: 2017.1.0b6, 5.6.1p1.

Note: reproduced with both Windows and macOS.

Dev Note: This issue requires a refactor of a core system, which is currently in-progress. The development team expects this refactor to be complete in version 2018.1. At that time, this issue will be automatically re-opened and re-tested to verify the fix.