KHR_material_unlit doesn't work for runtime loaded assets

[nlsdvl]

A sample asset using KHR_material_unlit is imported and instantiated in a new scene from the unity editor, and renders properly on target devices.

The same asset loaded and instantiated at runtime by rt-xr-unity-player doesn't render KHR_material_unlit properly.

[nlsdvl]

the relevant shader is not imported into the unity project's ressources directory. it works in the editor, but not on compiled project.