Move lerp code to LightEvaluation.hlsl

com.unity.render-pipelines.high-definition/HDRP/Lighting/LightEvaluation.hlsl

             // Note: we do not modify the distance to the light, or the light angle for the back face.
             // This is a performance-saving optimization which makes sense as long as the thickness is small.
         }
+        
+        transmittance = lerp( bsdfData.transmittance, transmittance, lightData.shadowDimmer);
     }
 
     return transmittance;

com.unity.render-pipelines.high-definition/HDRP/Material/Lit/Lit.hlsl

     {
         // Caution: This function modify N and lightData.contactShadowIndex
         transmittance = PreEvaluatePunctualLightTransmission(lightLoopContext, posInput, distances.x, NdotL, L, bsdfData, N, lightData);
-        transmittance = lerp( bsdfData.transmittance, transmittance, lightData.shadowDimmer);
     }
 
     float3 color;