Mixedrealitytoolkit-unity: Updating to MRTK 2.5.1 on iOS breaks MRTK materials, StandardShader not found

[genereddick]

When I update the Foundation package to MRTK 2.5.1 on iOS using the Package manager, all materials using the MRTK shaders break and for the shader selected on the material show "Hidden/InternalErrorShader".

Searching for the MixedRealityStandard.shader returns no results when pointing to 2.5.1.

To reproduce

On iOS in the Package manager or manifest file, change the Foundation version from 2.50 to 2.5.1

Expected behavior

This works on Windows, shaders update properly and no errors.

Your setup (please complete the following information)

Unity version 2019.4.13fa

Reverting to 2.5.0 fixes the shader issues.

[keveleigh]

This sounds like the issue caused by https://github.com/microsoft/MixedRealityToolkit-Unity/issues/8826. @davidkline-ms had a workaround I believe

[genereddick]

That was it @keveleigh, thanks! Note you have to exit and reload Unity the the MRTK shader folder to be imported.

[davidkline-ms]

Thanks @genereddick. We will investigate a better solution than having to close and reload.