M_Cave_Ground_Mud has an error which keeps floor in Particle Effects Sample from Rendering

Something must have changed with how LERP's or Vector Transforms deal with a float 0 value, which breaks this particular material

Error:
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Fix:
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1. Open Particle Effects Sample

RESULTS: After Shader Compile, the Floor of the Cave renders as World Grid Material

EXPECTED: Muddy, Icy Floor Rendered

Particle Effects Demo problem