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

 #endif
 
         // Volumetric don't use screenspace shadow. Transparent neither (as we don't have the depth information)
-#if (SHADERPASS != SHADERPASS_VOLUMETRIC_LIGHTING && !defined(_SURFACE_TYPE_TRANSPARENT))
+#ifndef _SURFACE_TYPE_TRANSPARENT
         shadow = min(shadow, GetContactShadow(lightLoopContext, lightData.contactShadowIndex));
 #endif
     }
 #endif
 
         // Volumetric don't use screenspace shadow. Transparent neither (as we don't have the depth information)
-#if (SHADERPASS != SHADERPASS_VOLUMETRIC_LIGHTING && !defined(_SURFACE_TYPE_TRANSPARENT))
+#ifndef _SURFACE_TYPE_TRANSPARENT
         shadow = min(shadow, GetContactShadow(lightLoopContext, lightData.contactShadowIndex));
 #endif
     }

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

             float3 L = -light.forward; // Lights point backwards in Unity
 
             float3 color; float attenuation;
+            light.contactShadowIndex = -1; // Disable shadow contact if any
             EvaluateLight_Directional(context, posInput, light, unused, 0, L,
                                       color, attenuation);
 
                     float3 L             = -lightToSample * distRcp;
 
                     float3 color; float attenuation;
+                    light.contactShadowIndex = -1; // Disable shadow contact if any
                     EvaluateLight_Punctual(context, posInput, light, unused,
                                            0, L, lightToSample, distances,
                                            color, attenuation);
                     float  distProj      = dot(lightToSample, light.forward);
                     float4 distances     = float4(1, 1, 1, distProj);
 
-                    float3 color; float attenuation; float attenuationNoContactShadows;
+                    float3 color; float attenuation;
+                    light.contactShadowIndex = -1; // Disable shadow contact if any
                     EvaluateLight_Punctual( context, posInput, light, unused,
                                             0, L, lightToSample, distances,
                                             color, attenuation);