Use the correct sampler for density volumes

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

     float halfTexelSize = 0.5f * rcp(mipSize);
     voxelCenterUVW.z    = clamp(voxelCenterUVW.z, offset + halfTexelSize, offset + rcpNumTextures - halfTexelSize);
     
-    return SAMPLE_TEXTURE3D_LOD(_VolumeMaskAtlas, s_trilinear_clamp_sampler, voxelCenterUVW, lod).a;
+    // Reminder: still no filtering across the the wrap in Z.
+    return SAMPLE_TEXTURE3D_LOD(_VolumeMaskAtlas, s_trilinear_repeat_sampler, voxelCenterUVW, lod).a;
 }
 
 

com.unity.render-pipelines.high-definition/HDRP/ShaderVariables.hlsl

 SAMPLER(s_linear_clamp_sampler);
 SAMPLER(s_linear_repeat_sampler);
 SAMPLER(s_trilinear_clamp_sampler);
+SAMPLER(s_trilinear_repeat_sampler);
 
 // ----------------------------------------------------------------------------