diff --git a/extensions/feishu/src/thread-bindings.test.ts b/extensions/feishu/src/thread-bindings.test.ts
index fa10730247b..d02b392d8f4 100644
--- a/extensions/feishu/src/thread-bindings.test.ts
+++ b/extensions/feishu/src/thread-bindings.test.ts
@@ -91,4 +91,53 @@ describe("Feishu thread bindings", () => {
       }),
     ).toBeNull();
   });
+
+  it("preserves delivery routing metadata when rebinding the same conversation", async () => {
+    const manager = createFeishuThreadBindingManager({ cfg: baseCfg, accountId: "default" });
+
+    manager.bindConversation({
+      conversationId: "oc_group_chat:topic:om_topic_root:sender:ou_sender_1",
+      parentConversationId: "oc_group_chat",
+      targetKind: "subagent",
+      targetSessionKey: "agent:main:subagent:child",
+      metadata: {
+        agentId: "codex",
+        label: "child",
+        boundBy: "system",
+        deliveryTo: "user:ou_sender_1",
+        deliveryThreadId: "om_topic_root",
+      },
+    });
+
+    await getSessionBindingService().bind({
+      targetSessionKey: "agent:main:subagent:child",
+      targetKind: "subagent",
+      conversation: {
+        channel: "feishu",
+        accountId: "default",
+        conversationId: "oc_group_chat:topic:om_topic_root:sender:ou_sender_1",
+        parentConversationId: "oc_group_chat",
+      },
+      placement: "current",
+      metadata: {
+        label: "child",
+      },
+    });
+
+    expect(
+      getSessionBindingService().resolveByConversation({
+        channel: "feishu",
+        accountId: "default",
+        conversationId: "oc_group_chat:topic:om_topic_root:sender:ou_sender_1",
+      }),
+    ).toMatchObject({
+      metadata: expect.objectContaining({
+        agentId: "codex",
+        label: "child",
+        boundBy: "system",
+        deliveryTo: "user:ou_sender_1",
+        deliveryThreadId: "om_topic_root",
+      }),
+    });
+  });
 });
diff --git a/extensions/feishu/src/thread-bindings.ts b/extensions/feishu/src/thread-bindings.ts
index bc3661ac085..3b976a7c668 100644
--- a/extensions/feishu/src/thread-bindings.ts
+++ b/extensions/feishu/src/thread-bindings.ts
@@ -159,36 +159,41 @@ export function createFeishuThreadBindingManager(params: {
       metadata,
     }) => {
       const normalizedConversationId = conversationId.trim();
-      if (!normalizedConversationId || !targetSessionKey.trim()) {
+      const normalizedTargetSessionKey = targetSessionKey.trim();
+      if (!normalizedConversationId || !normalizedTargetSessionKey) {
         return null;
       }
+      const existing = getState().bindingsByAccountConversation.get(
+        resolveBindingKey({ accountId, conversationId: normalizedConversationId }),
+      );
       const now = Date.now();
       const record: FeishuThreadBindingRecord = {
         accountId,
         conversationId: normalizedConversationId,
-        parentConversationId: normalizeOptionalString(parentConversationId),
+        parentConversationId:
+          normalizeOptionalString(parentConversationId) ?? existing?.parentConversationId,
         deliveryTo:
           typeof metadata?.deliveryTo === "string" && metadata.deliveryTo.trim()
             ? metadata.deliveryTo.trim()
-            : undefined,
+            : existing?.deliveryTo,
         deliveryThreadId:
           typeof metadata?.deliveryThreadId === "string" && metadata.deliveryThreadId.trim()
             ? metadata.deliveryThreadId.trim()
-            : undefined,
+            : existing?.deliveryThreadId,
         targetKind: toFeishuTargetKind(targetKind),
-        targetSessionKey: targetSessionKey.trim(),
+        targetSessionKey: normalizedTargetSessionKey,
         agentId:
           typeof metadata?.agentId === "string" && metadata.agentId.trim()
             ? metadata.agentId.trim()
-            : resolveAgentIdFromSessionKey(targetSessionKey),
+            : (existing?.agentId ?? resolveAgentIdFromSessionKey(normalizedTargetSessionKey)),
         label:
           typeof metadata?.label === "string" && metadata.label.trim()
             ? metadata.label.trim()
-            : undefined,
+            : existing?.label,
         boundBy:
           typeof metadata?.boundBy === "string" && metadata.boundBy.trim()
             ? metadata.boundBy.trim()
-            : undefined,
+            : existing?.boundBy,
         boundAt: now,
         lastActivityAt: now,
       };