TextureArray asset format is not converted, causing runtime artifacts on non-mobile platforms

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.