Fix the duplicated QDQ attributes setup issue

onnxruntime/core/optimizer/qdq_transformer/ensure_unique_dq_for_node_unit.cc

@@ -53,7 +53,7 @@ Status DuplicateDQForOutputEdge(const graph_utils::GraphEdge& original_dq_output
                                     MakeString("Added by ", kTransformerName),
                                     dq_inputs,
                                     {&new_dq_output_nodearg},
-                                    nullptr,  // attributes
+                                    &original_dq_node.GetAttributes(),
                                     original_dq_node.Domain());
 
   // set up edges

onnxruntime/test/optimizer/ensure_unique_dq_for_node_unit_test.cc

@@ -233,4 +233,24 @@ TEST(EnsureUniqueDQForNodeUnitTests, QDQWithMultiConsumerDQNodes) {
   EXPECT_EQ(OpCount(op_count_before, "DequantizeLinear") + 4, OpCount(op_count_after, "DequantizeLinear"));
 }
 
+TEST(EnsureUniqueDQForNodeUnitTests, QDQWithMultiConsumerDQNodesPreservingAttributes) {
+  constexpr auto model_uri = ORT_TSTR("testdata/qdq_with_multi_consumer_q_dq_axis.onnx");
+
+  SessionOptions session_options{};
+  // test interaction with level 1 transformers
+  session_options.graph_optimization_level = TransformerLevel::Level1;
+
+  InferenceSessionWrapper session{session_options, GetEnvironment()};
+
+  ASSERT_STATUS_OK(session.Load(model_uri));
+
+  const auto op_count_before = CountOpsInGraph(session.GetGraph());
+
+  ASSERT_STATUS_OK(session.Initialize());
+
+  const auto op_count_after = CountOpsInGraph(session.GetGraph());
+
+  EXPECT_EQ(OpCount(op_count_before, "DequantizeLinear") + 8, OpCount(op_count_after, "DequantizeLinear"));
+}
+
 }  // namespace onnxruntime::test