diff --git a/api/core/workflow/nodes/answer/answer_stream_processor.py b/api/core/workflow/nodes/answer/answer_stream_processor.py
index d94f0590584842..e1bff3de488f4c 100644
--- a/api/core/workflow/nodes/answer/answer_stream_processor.py
+++ b/api/core/workflow/nodes/answer/answer_stream_processor.py
@@ -61,7 +61,11 @@ def process(self, generator: Generator[GraphEngineEvent, None, None]) -> Generat
                     del self.current_stream_chunk_generating_node_ids[event.route_node_state.node_id]
 
                 # remove unreachable nodes
-                self._remove_unreachable_nodes(event)
+                # FIXME: because of the code branch can combine directly, so for answer node
+                # we remove the node maybe shortcut the answer node, so comment this code for now
+                # there is not effect on the answer node and the workflow, when we have a better solution
+                # we can open this code. Issues: #11542 #9560 #10638 #10564
+                # self._remove_unreachable_nodes(event)
 
                 # generate stream outputs
                 yield from self._generate_stream_outputs_when_node_finished(event)
diff --git a/api/tests/unit_tests/core/workflow/graph_engine/test_graph_engine.py b/api/tests/unit_tests/core/workflow/graph_engine/test_graph_engine.py
index 9f1ba7b6af9c80..29aa64d80145a5 100644
--- a/api/tests/unit_tests/core/workflow/graph_engine/test_graph_engine.py
+++ b/api/tests/unit_tests/core/workflow/graph_engine/test_graph_engine.py
@@ -488,16 +488,14 @@ def test_run_branch(mock_close, mock_remove):
     items = []
     generator = graph_engine.run()
     for item in generator:
-        # print(type(item), item)
         items.append(item)
 
     assert len(items) == 10
     assert items[3].route_node_state.node_id == "if-else-1"
     assert items[4].route_node_state.node_id == "if-else-1"
-    assert isinstance(items[5], NodeRunStreamChunkEvent)
-    assert items[5].chunk_content == "1 "
-    assert isinstance(items[6], NodeRunStreamChunkEvent)
-    assert items[6].chunk_content == "takato"
+    assert isinstance(items[8], NodeRunStreamChunkEvent)
+    # assert items[6].chunk_content == "takato"
+    assert items[8].chunk_content == "takato"
     assert items[7].route_node_state.node_id == "answer-1"
     assert items[8].route_node_state.node_id == "answer-1"
     assert items[8].route_node_state.node_run_result.outputs["answer"] == "1 takato"