Need some help debugging a scene. Error is "t is undefined"

I exported this a scene (see attachments). When i drop it in the sandbox i get the error “t is undefined”. Can anybody name the problem i am facing right now? The error message is not helpful.
Best, Mamu
scene.zip (5.4 KB)

There’s a bug in the serialization/parse code of the GridMaterial class. This PR should correct that:

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