diff --git a/lib/core/Handles/HandlesExprCall.py b/lib/core/Handles/HandlesExprCall.py
index 729e7bd..768f9c4 100644
--- a/lib/core/Handles/HandlesExprCall.py
+++ b/lib/core/Handles/HandlesExprCall.py
@@ -2931,11 +2931,21 @@ class ExprCallHandle(BaseHandle):
             if SpecClass:
                 ClassName = SpecClass
         struct_sha1_map = getattr(Gen, '_struct_sha1_map', {})
-        class_sha1 = struct_sha1_map.get(ClassName)
-        if class_sha1:
-            FullMethodName = f'{class_sha1}.{ClassName}.{MethodName}'
-        else:
+        # 归一化：ClassName 可能带 sha1 前缀（跨模块 structs 表键，如
+        # "940e5294667daf5a.ExprGenAttr"），其前 16 位即模块 sha1，直接用作
+        # class_sha1 并免拼接（否则 struct_sha1_map.get(带前缀名)=None → class_sha1
+        # 为空 → 下方 stub 查找路径被跳过 → fail-fast "Undefined method
+        # 'get_attribute_ptr' in class '...ExprGenAttr'"）。裸类名则从映射表取 sha1。
+        cls_has_prefix: bool = len(ClassName) > 17 and ClassName[16] == '.'
+        if cls_has_prefix:
+            class_sha1 = ClassName[:16]
             FullMethodName = f'{ClassName}.{MethodName}'
+        else:
+            class_sha1 = struct_sha1_map.get(ClassName)
+            if class_sha1:
+                FullMethodName = f'{class_sha1}.{ClassName}.{MethodName}'
+            else:
+                FullMethodName = f'{ClassName}.{MethodName}'
 
         # 泛型特化类方法按需完整特化：当 ClassName 是特化名（如 ndarray[double]）
         # 且缓存中只有 declare_only 版本时，补发方法体。否则方法调用会查找