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				@@ -57,11 +57,19 @@ class StreamProcessor(ABC): 
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				                     # The branch_identify parameter is added to ensure that 
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				                     # only nodes in the correct logical branch are included. 
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				+                    reachable_node_ids.append(edge.target_node_id) 
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				                     ids = self._fetch_node_ids_in_reachable_branch(edge.target_node_id, run_result.edge_source_handle) 
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				                     reachable_node_ids.extend(ids) 
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				                 else: 
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				+                    # if the condition edge in parallel, and the target node is not in parallel, we should not remove it 
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				+                    # Issues: #13626 
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				+                    if ( 
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				+                        finished_node_id in self.graph.node_parallel_mapping 
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				+                        and edge.target_node_id not in self.graph.parallel_mapping 
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				+                    ): 
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				+                        continue 
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				                     unreachable_first_node_ids.append(edge.target_node_id) 
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				- 
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				+            unreachable_first_node_ids = list(set(unreachable_first_node_ids) - set(reachable_node_ids)) 
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				             for node_id in unreachable_first_node_ids: 
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				                 self._remove_node_ids_in_unreachable_branch(node_id, reachable_node_ids) 
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