diff --git a/backend/app/api/pl/transport.py b/backend/app/api/pl/transport.py
index 0c84d62e7..720d4aec0 100644
--- a/backend/app/api/pl/transport.py
+++ b/backend/app/api/pl/transport.py
@@ -977,9 +977,8 @@ def arrange_transport(
         and plan.plan_type in ("inbound", "outbound")
         and payload.generate_dibang_plan
     )
-    should_sync_stop_dibang = use_multi_stop_dibang and any(
-        item.generate_dibang for item in stop_dibang_options
-    )
+    # 有 stop 选项即同步：全 false 也要进 upsert，才能取消勾选 / 已过磅阻断
+    should_sync_stop_dibang = use_multi_stop_dibang and bool(stop_dibang_options)
 
     if should_sync_stop_dibang or should_sync_legacy_dibang:
         try:
diff --git a/backend/tests/test_pl_dibang_upsert_on_arrange.py b/backend/tests/test_pl_dibang_upsert_on_arrange.py
index bc5bd157d..f4f229d0d 100644
--- a/backend/tests/test_pl_dibang_upsert_on_arrange.py
+++ b/backend/tests/test_pl_dibang_upsert_on_arrange.py
@@ -647,3 +647,13 @@ def test_arrange_transport_source_has_no_revoke_call():
 
     src = inspect.getsource(transport_api.arrange_transport)
     assert "revoke_regeneratable_dibang_for_transport" not in src
+
+
+def test_arrange_transport_syncs_stop_dibang_even_when_all_unchecked():
+    """全部取消勾选时仍应进入按段 sync，以便取消/已过磅阻断生效。"""
+    import inspect
+    from app.api.pl import transport as transport_api
+
+    src = inspect.getsource(transport_api.arrange_transport)
+    assert "bool(stop_dibang_options)" in src
+    assert "item.generate_dibang for item in stop_dibang_options" not in src