diff --git a/unilabos/devices/workstation/bioyond_studio/sirna_station/sirna_station.py b/unilabos/devices/workstation/bioyond_studio/sirna_station/sirna_station.py
index d9c8767d..c6a34a32 100644
--- a/unilabos/devices/workstation/bioyond_studio/sirna_station/sirna_station.py
+++ b/unilabos/devices/workstation/bioyond_studio/sirna_station/sirna_station.py
@@ -431,13 +431,14 @@ class BioyondSirnaStation(BioyondWorkstation):
     )
     def resync_external_materials(
         self,
-        refresh_material_cache: bool = True,
+        refresh_material_cache: bool = False,
         **kwargs: Any,
     ) -> Dict[str, Any]:
         """手动触发共享 Bioyond 外部物料同步。
 
         Args:
-            refresh_material_cache: 同步前是否调用 Bioyond 物料缓存刷新（若 RPC 支持）。
+            refresh_material_cache: 是否在同步前额外刷新 Bioyond 物料缓存。通常保持 False，
+                共享同步路径会用同一次库存查询结果更新缓存。
         """
         with self._debug_call_session("resync_external_materials"):
             api_host = self._kwarg_text(kwargs, "api_host")
@@ -1813,7 +1814,7 @@ class BioyondSirnaStation(BioyondWorkstation):
     def _run_shared_external_material_sync(
         self,
         rpc: Optional[Any] = None,
-        refresh_material_cache: bool = True,
+        refresh_material_cache: bool = False,
     ) -> Dict[str, Any]:
         """为 reset / 手动 resync 运行共享 Bioyond 外部物料同步路径。"""
         if rpc is None:
@@ -3865,6 +3866,8 @@ class BioyondSirnaStation(BioyondWorkstation):
         return False
 
 
+# TODO: Refactor this into a small BioyondResourceSynchronizer classification hook
+# before re-enabling long-term; keep only the Sirna reagent-as-liquid rule here.
 class SirnaResourceSynchronizer(BioyondResourceSynchronizer):
     """Sirna-specific resource synchronizer.
 
diff --git a/unilabos/devices/workstation/bioyond_studio/station.py b/unilabos/devices/workstation/bioyond_studio/station.py
index d9e9f166..eb888a95 100644
--- a/unilabos/devices/workstation/bioyond_studio/station.py
+++ b/unilabos/devices/workstation/bioyond_studio/station.py
@@ -176,6 +176,8 @@ class BioyondResourceSynchronizer(ResourceSynchronizer):
                 logger.warning("从Bioyond获取的物料数据为空")
                 return False
 
+            self._update_material_cache_from_stock(all_bioyond_data)
+
             # 转换为UniLab格式
             unilab_resources = resource_bioyond_to_plr(
                 all_bioyond_data,
@@ -189,6 +191,29 @@ class BioyondResourceSynchronizer(ResourceSynchronizer):
             logger.error(f"从Bioyond同步物料数据失败: {e}")
             return False
 
+    def _update_material_cache_from_stock(self, materials: List[Dict[str, Any]]) -> None:
+        """用本次库存查询结果同步 RPC 的 name -> material id 缓存。"""
+        material_cache = getattr(self.bioyond_api_client, "material_cache", None)
+        if not isinstance(material_cache, dict):
+            return
+
+        before_count = len(material_cache)
+        for material in materials:
+            material_name = material.get("name")
+            material_id = material.get("id")
+            if material_name and material_id:
+                material_cache[material_name] = material_id
+
+            for detail_material in material.get("detail", []) or []:
+                detail_name = detail_material.get("name")
+                detail_id = detail_material.get("detailMaterialId") or detail_material.get("id")
+                if detail_name and detail_id:
+                    material_cache[detail_name] = detail_id
+
+        logger.debug(
+            f"已用Bioyond库存同步物料缓存: {before_count} -> {len(material_cache)}"
+        )
+
     def sync_to_external(self, resource: Any) -> bool:
         """将本地物料数据变更同步到Bioyond系统"""
         try:
@@ -1404,11 +1429,7 @@ class BioyondWorkstation(WorkstationBase):
             if self.hardware_interface:
                 self.hardware_interface.scheduler_reset()
 
-            # 刷新物料缓存
-            if self.hardware_interface:
-                self.hardware_interface.refresh_material_cache()
-
-            # 重新同步资源
+            # 重新同步资源，并用同一次库存查询结果更新物料缓存
             if self.resource_synchronizer:
                 self.resource_synchronizer.sync_from_external()
 
diff --git a/unilabos/resources/graphio.py b/unilabos/resources/graphio.py
index 52771289..4e659bc2 100644
--- a/unilabos/resources/graphio.py
+++ b/unilabos/resources/graphio.py
@@ -934,7 +934,12 @@ def resource_bioyond_to_plr(bioyond_materials: list[dict], type_mapping: Dict[st
                             )
 
                         current_resource = warehouse[idx]
-                        if current_resource is None or isinstance(current_resource, ResourceHolder):
+                        if current_resource is None or isinstance(current_resource, (ResourceHolder, str)):
+                            if isinstance(current_resource, str):
+                                logger.warning(
+                                    f"⚠️ 物料 {unique_name} 覆盖 {wh_name}[{idx}]"
+                                    f"{f'({slot_key})' if slot_key else ''} 的旧占位 occupied_by={current_resource!r}"
+                                )
                             # 物料尺寸已在放入warehouse前根据需要进行了交换
                             warehouse[idx] = plr_material
                             logger.debug(