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

     shadow = shadowMask = (lightData.shadowMaskSelector.x >= 0.0) ? dot(bakeLightingData.bakeShadowMask, lightData.shadowMaskSelector) : 1.0;
 #endif
 
-    // We test NdotL > 0.0 to not sample the shadow map if it is not required.
-    // In case of thin mode we always need to perform the fetch as we reuse it for back and front lighting
+    // We test NdotL >= 0.0 to not sample the shadow map if it is not required.
     UNITY_BRANCH if (lightData.shadowIndex >= 0 && (dot(N, L) >= 0.0))
     {
 #ifdef USE_DEFERRED_DIRECTIONAL_SHADOWS

com.unity.render-pipelines.high-definition/HDRP/Lighting/Volumetrics/VolumetricLighting.compute

             DirectionalLightData light = _DirectionalLightDatas[i];
             float3 L = -light.forward; // Lights point backwards in Unity
 
-            float3 color; float attenuation; float attenuationNoContactShadows;
+            float3 color; float attenuation;
             EvaluateLight_Directional(context, posInput, light, unused, 0, L,
                                       color, attenuation);
 
                     float4 distances     = float4(dist, distSq, distRcp, distProj);
                     float3 L             = -lightToSample * distRcp;
 
-                    float3 color; float attenuation; float attenuationNoContactShadows;
+                    float3 color; float attenuation;
                     EvaluateLight_Punctual(context, posInput, light, unused,
                                            0, L, lightToSample, distances,
                                            color, attenuation);