diff --git a/web/app/components/workflow/panel/debug-and-preview/hooks.ts b/web/app/components/workflow/panel/debug-and-preview/hooks.ts
index a9e961874e..20aece660f 100644
--- a/web/app/components/workflow/panel/debug-and-preview/hooks.ts
+++ b/web/app/components/workflow/panel/debug-and-preview/hooks.ts
@@ -518,6 +518,8 @@ export const useChat = (
           upsertTopLevelTracingNodeOnStart(responseItem.workflowProcess!.tracing!, {
             ...data,
             status: NodeRunningStatus.Running,
+          }, {
+            reuseRunningNodeId: true,
           })
           updateCurrentQAOnTree({
             placeholderQuestionId,
@@ -807,6 +809,8 @@ export const useChat = (
           upsertTopLevelTracingNodeOnStart(responseItem.workflowProcess.tracing, {
             ...nodeStartedData,
             status: NodeRunningStatus.Running,
+          }, {
+            reuseRunningNodeId: true,
           })
         })
       },
diff --git a/web/app/components/workflow/utils/top-level-tracing.spec.ts b/web/app/components/workflow/utils/top-level-tracing.spec.ts
index b18b642076..2fa3dda1ed 100644
--- a/web/app/components/workflow/utils/top-level-tracing.spec.ts
+++ b/web/app/components/workflow/utils/top-level-tracing.spec.ts
@@ -105,12 +105,33 @@ describe('upsertTopLevelTracingNodeOnStart', () => {
       status: NodeRunningStatus.Running,
     })
 
-    const updated = upsertTopLevelTracingNodeOnStart(tracing, startedNode)
+    const updated = upsertTopLevelTracingNodeOnStart(tracing, startedNode, {
+      reuseRunningNodeId: true,
+    })
 
     expect(updated).toBe(true)
     expect(tracing).toEqual([startedNode])
   })
 
+  it('should keep separate running top-level traces by default when a new execution id appears', () => {
+    const existingTrace = createTrace({
+      id: 'trace-1',
+      node_id: 'node-1',
+      status: NodeRunningStatus.Running,
+    })
+    const tracing: NodeTracing[] = [existingTrace]
+    const startedNode = createTrace({
+      id: 'trace-2',
+      node_id: 'node-1',
+      status: NodeRunningStatus.Running,
+    })
+
+    const updated = upsertTopLevelTracingNodeOnStart(tracing, startedNode)
+
+    expect(updated).toBe(true)
+    expect(tracing).toEqual([existingTrace, startedNode])
+  })
+
   it('should ignore nested iteration node starts even when the node id matches a top-level trace', () => {
     const existingTrace = createTrace({
       id: 'top-level-trace',
diff --git a/web/app/components/workflow/utils/top-level-tracing.ts b/web/app/components/workflow/utils/top-level-tracing.ts
index 817bd9eb8f..3ca57f3768 100644
--- a/web/app/components/workflow/utils/top-level-tracing.ts
+++ b/web/app/components/workflow/utils/top-level-tracing.ts
@@ -8,6 +8,9 @@ const isNestedTracingNode = (trace: Pick<NodeTracing, 'iteration_id' | 'loop_id'
 export const upsertTopLevelTracingNodeOnStart = (
   tracing: NodeTracing[],
   startedNode: NodeTracing,
+  options?: {
+    reuseRunningNodeId?: boolean
+  },
 ) => {
   if (isNestedTracingNode(startedNode))
     return false
@@ -16,6 +19,9 @@ export const upsertTopLevelTracingNodeOnStart = (
     if (item.id === startedNode.id)
       return true
 
+    if (!options?.reuseRunningNodeId)
+      return false
+
     return item.node_id === startedNode.node_id && item.status === NodeRunningStatus.Running
   })
   if (currentIndex > -1)