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Grass foliage not matching terrain lighting, despite matching color and normals (as far as I know).

For debugging purposes i made a dummy grass that does nothing fancy and turned off the light’s shadows. The grass blends in perfectly on flat terrain.
I Input a 0,0,1 vertex as a normal to make it point upwards, put it through a local to world converter, and disable tangent space normals, and have the foliage align to the terrain. Yet my grass darker than the light areas of my landscape, and lighter than the dark areas of my terrain.

What more should I be looking into to see what could be the issue?

Same issue for me