Reproduction steps:
* Open "SampleScene" in project [https://github.com/Wilfrid-Unity/test-unity-etc-texturearray-asset]
* Build and Run on Mobile, Desktop, Console Platforms

Expected Results:
* For all Standalone platforms, the scene looks the same as in Editor (one blue cube and one green cube).

Actual Results:
* The scene looks the same as in the Editor, when running on Android.
* The scene has artifacts, when running on PC Standalone player (as well as consoles) ; the cubes are rendered with incorrect colors.

Additional Information:
* The scene uses the Texture2DArray asset generated by running the Editor script "Texture2DArrayAssetCreator/Generate ETC2 Texture2D Array Asset". This script mimics the behavior of a popular Asset Store shader solution.
* ETC format is not supported on non-mobile platforms ; however Unity attempts to load it at run-time, resulting in artifacts.
* Ideally, the build process should convert these textures to a format supported by the target platform. At the very least, build process should issue warning/errors regarding Texture2DArray assets in the build that have formats unsupported by the target platform.