diff --git a/source/blender/blenkernel/intern/data_transfer.cc b/source/blender/blenkernel/intern/data_transfer.cc
index 822ed9ad135..4bf8d305e6b 100644
--- a/source/blender/blenkernel/intern/data_transfer.cc
+++ b/source/blender/blenkernel/intern/data_transfer.cc
@@ -1060,7 +1060,9 @@ static bool data_transfer_layersmapping_generate(ListBase *r_map,
         dst_data = static_cast<float3 *>(CustomData_add_layer(
             &me_dst->corner_data, CD_NORMAL, CD_SET_DEFAULT, me_dst->corners_num));
       }
-      MutableSpan(dst_data, me_dst->corners_num).copy_from(me_dst->corner_normals());
+      if (mix_factor != 1.0f) {
+        MutableSpan(dst_data, me_dst->corners_num).copy_from(me_dst->corner_normals());
+      }
       /* Post-process will convert it back to CD_CUSTOMLOOPNORMAL. */
       data_transfer_layersmapping_add_item_cd(r_map,
                                               CD_NORMAL,