diff --git a/unilabos/resources/itemized_carrier.py b/unilabos/resources/itemized_carrier.py
index fe55c39e..6114716a 100644
--- a/unilabos/resources/itemized_carrier.py
+++ b/unilabos/resources/itemized_carrier.py
@@ -179,6 +179,11 @@ class ItemizedCarrier(ResourcePLR):
           idx = i
           break
 
+    if idx is None:
+      # 反序列化时无法匹配 site（名称或坐标均不符），退回父类默认分配，不更新 site 跟踪
+      super().assign_child_resource(resource, location=location, reassign=reassign)
+      return
+
     if not reassign and self.sites[idx] is not None:
       raise ValueError(f"a site with index {idx} already exists")
     location = list(self.child_locations.values())[idx]
diff --git a/unilabos/resources/resource_tracker.py b/unilabos/resources/resource_tracker.py
index 14b2c221..ecf85303 100644
--- a/unilabos/resources/resource_tracker.py
+++ b/unilabos/resources/resource_tracker.py
@@ -611,9 +611,10 @@ class ResourceTreeSet(object):
             }
             if has_model:
                 d["model"] = res.config.get("model", None)
-            # 防止 Deck 子类在 __init__ 中调用 setup() 预分配子资源，
-            # 与 PLR deserialize 从 children 列表再次分配同名资源产生命名冲突
-            if "setup" in d:
+            # 仅当 PLR dict 中含有子节点时才禁用 setup()，
+            # 防止 setup() 预分配子资源后 PLR deserialize 再次分配同名资源产生命名冲突。
+            # 若 children 为空，则保留 setup=True，依赖 setup() 来初始化仓库。
+            if "setup" in d and d.get("children"):
                 d["setup"] = False
             return d