[lib] fixed a bug on node lookup assignment in RR graph I/O when supporting multiple ptc

Author: tangxifan

libs/librrgraph/src/io/rr_graph_uxsdcxx_serializer.h

@@ -1792,13 +1792,14 @@ class RrGraphSerializer final : public uxsd::RrGraphBase<RrGraphContextTypes> {
         /* Add the correct node into the vector */
         for (size_t inode = 0; inode < rr_nodes_->size(); inode++) {
             auto node = (*rr_nodes_)[inode];
-            rr_graph_builder.add_node_to_all_locs(node.id());
             /* Set track numbers as a node may have multiple ptc */
             if (rr_graph_builder.node_contain_multiple_ptc(node.id())) {
                 if (CHANX == rr_graph_->node_type(node.id()) || CHANY == rr_graph_->node_type(node.id())) {
                     rr_graph_builder.add_track_node_to_lookup(node.id());
                 }
-            }
+            } else {
+                rr_graph_builder.add_node_to_all_locs(node.id());
+            }    
         }
     }