After importing "The Courtyard" project, some shaders are pink due to errors

1. What happened

Some of the custom shaders result in errors like:
Shader error in 'Standard DirSpecHalfLambert (Specular setup)': unrecognized identifier 'Unity_GlossyEnvironmentData' at Assets/Shaders/Standard-DirSpecHalfLambert/UnityGlobalIllumination2.cginc(172)

2. How we can reproduce it using the example you attached

- Download and import "The Courtyard" project form the Asset Store;
- Open the Scenes/Courtyard Scene;
- Notice that almost all textures seem to be missing (See the attached screenshot).

Regression: Seemingly introduced in 5.5 shader refactor