invalid subscript '_ShadowCoord' at UCTS_DoubleShadeWithFeather

[The-RealBobi]

Describe the bug
Any build that uses the Toon Shader fails at "Computing Shader Variants" logging the following error:

ERROR: Shader error in 'Toon': invalid subscript '_ShadowCoord' at Studio/<PROJECT>/Library/PackageCache/com.unity.toonshader@55c98bb9b707/Runtime/Legacy/Shaders/UCTS_DoubleShadeWithFeather.cginc(124) (on metal)

WARNING: Shader warning in 'Toon': _FORWARD_PLUS shader keyword has been deprecated. Please update your shaders to use _CLUSTER_LIGHT_LOOP shader keyword instead, otherwise shader compilation times may be negatively affected. at /Users/<user>/Documents/Game Studio/<PROJECT>/Library/PackageCache/com.unity.render-pipelines.universal@1e1527b3a17b/ShaderLibrary/ForwardPlusKeyword.deprecated.hlsl(12)

(...)

To Reproduce
Steps to reproduce the behavior:

1. Download the Universal 3D Sample Template.
2. Install the Toon Shader package, and create a material that uses it
3. Just make a build using the latest Toon Shader version

Expected behavior
To get a functional build that uses the Toon Shader correctly.

Desktop (please complete the following information):

• OS: macOS Tahoe 26.0
• Engine: Unity 6000.2.6f2

Additional context

• I tried moving the project to another drive yet the same error logged (with the same directory: [Studio//Library/PackageCache])
• I tried deleting the Library folder

[sindharta-tanuwijaya]

Hi. Thank you for taking the time to report this issue.

I’ve been able to reproduce it on my end as well.
A question: after you hit this error, could you please try building again and see if you still see the same error (without doing a clean build) ?

[The-RealBobi]

Hi, I tried to rebuild, with the same error appearing again.

However, in another test I did, clearing the Library after some days and then rebuilding actually finished the build successfully, but after retrying the build, it bounced back to hitting the same error.