Reproduction steps:
1. Open the "bug.zip" project.
2. Build "test" scene for WebGL platform.
3. Play the build
4. Wait for the texture to be loaded.
5. Notice the texture

Note: It works fine in the editor and windows standalone.

Actual result: Texture is not loaded correctly.
Expected result: Textures are the same in both Editor and WebGL build

Reproduced on: 5.4.0p2, 5.4.0f3, 5.3.6p3 5.3.5f1