diff --git a/libs/core/langchain_core/_api/beta_decorator.py b/libs/core/langchain_core/_api/beta_decorator.py
index 84c18c581e7..280c1c99c27 100644
--- a/libs/core/langchain_core/_api/beta_decorator.py
+++ b/libs/core/langchain_core/_api/beta_decorator.py
@@ -124,7 +124,7 @@ def beta(
             _name = _name or obj.__name__
             old_doc = obj.__doc__
 
-            def finalize(_: Any, new_doc: str) -> T:
+            def finalize(wrapper: Callable[..., Any], new_doc: str) -> T:
                 """Finalize the annotation of a class."""
                 try:
                     obj.__doc__ = new_doc
@@ -153,30 +153,36 @@ def beta(
             _name = _name or obj.fget.__name__
             old_doc = obj.__doc__
 
-            class _beta_property(type(obj)):  # type: ignore
+            class _beta_property(property):
                 """A beta property."""
 
-                def __get__(self, instance, owner=None):  # type: ignore
+                def __init__(self, fget=None, fset=None, fdel=None, doc=None):
+                    super().__init__(fget, fset, fdel, doc)
+                    self.__orig_fget = fget
+                    self.__orig_fset = fset
+                    self.__orig_fdel = fdel
+
+                def __get__(self, instance, owner=None):
                     if instance is not None or owner is not None:
                         emit_warning()
-                    return super().__get__(instance, owner)
+                    return self.fget(instance)
 
-                def __set__(self, instance, value):  # type: ignore
+                def __set__(self, instance, value):
                     if instance is not None:
                         emit_warning()
-                    return super().__set__(instance, value)
+                    return self.fset(instance, value)
 
-                def __delete__(self, instance):  # type: ignore
+                def __delete__(self, instance):
                     if instance is not None:
                         emit_warning()
-                    return super().__delete__(instance)
+                    return self.fdel(instance)
 
-                def __set_name__(self, owner, set_name):  # type: ignore
+                def __set_name__(self, owner, set_name):
                     nonlocal _name
                     if _name == "<lambda>":
                         _name = set_name
 
-            def finalize(_: Any, new_doc: str) -> Any:  # type: ignore
+            def finalize(wrapper: Callable[..., Any], new_doc: str) -> Any:
                 """Finalize the property."""
                 return _beta_property(
                     fget=obj.fget, fset=obj.fset, fdel=obj.fdel, doc=new_doc
@@ -186,12 +192,10 @@ def beta(
             if not _obj_type:
                 _obj_type = "function"
             wrapped = obj
-            _name = _name or obj.__name__  # type: ignore
+            _name = _name or obj.__name__
             old_doc = wrapped.__doc__
 
-            def finalize(  # type: ignore
-                wrapper: Callable[..., Any], new_doc: str
-            ) -> T:
+            def finalize(wrapper: Callable[..., Any], new_doc: str) -> T:
                 """Wrap the wrapped function using the wrapper and update the docstring.
 
                 Args:
diff --git a/libs/core/langchain_core/_api/deprecation.py b/libs/core/langchain_core/_api/deprecation.py
index 484d591f1ba..31304665e02 100644
--- a/libs/core/langchain_core/_api/deprecation.py
+++ b/libs/core/langchain_core/_api/deprecation.py
@@ -162,7 +162,7 @@ def deprecated(
             )
             old_doc = obj.__doc__
 
-            def finalize(_: Any, new_doc: str) -> T:
+            def finalize(wrapper: Callable[..., Any], new_doc: str) -> T:
                 """Finalize the deprecation of a class."""
                 try:
                     obj.__doc__ = new_doc
@@ -191,30 +191,36 @@ def deprecated(
             _name = _name or obj.fget.__name__
             old_doc = obj.__doc__
 
-            class _deprecated_property(type(obj)):  # type: ignore
+            class _deprecated_property(property):
                 """A deprecated property."""
 
-                def __get__(self, instance, owner=None):  # type: ignore
+                def __init__(self, fget=None, fset=None, fdel=None, doc=None):
+                    super().__init__(fget, fset, fdel, doc)
+                    self.__orig_fget = fget
+                    self.__orig_fset = fset
+                    self.__orig_fdel = fdel
+
+                def __get__(self, instance, owner=None):
                     if instance is not None or owner is not None:
                         emit_warning()
-                    return super().__get__(instance, owner)
+                    return self.fget(instance)
 
-                def __set__(self, instance, value):  # type: ignore
+                def __set__(self, instance, value):
                     if instance is not None:
                         emit_warning()
-                    return super().__set__(instance, value)
+                    return self.fset(instance, value)
 
-                def __delete__(self, instance):  # type: ignore
+                def __delete__(self, instance):
                     if instance is not None:
                         emit_warning()
-                    return super().__delete__(instance)
+                    return self.fdel(instance)
 
-                def __set_name__(self, owner, set_name):  # type: ignore
+                def __set_name__(self, owner, set_name):
                     nonlocal _name
                     if _name == "<lambda>":
                         _name = set_name
 
-            def finalize(_: Any, new_doc: str) -> Any:  # type: ignore
+            def finalize(wrapper: Callable[..., Any], new_doc: str) -> Any:
                 """Finalize the property."""
                 return _deprecated_property(
                     fget=obj.fget, fset=obj.fset, fdel=obj.fdel, doc=new_doc
@@ -224,12 +230,10 @@ def deprecated(
             if not _obj_type:
                 _obj_type = "function"
             wrapped = obj
-            _name = _name or obj.__name__  # type: ignore
+            _name = _name or obj.__name__
             old_doc = wrapped.__doc__
 
-            def finalize(  # type: ignore
-                wrapper: Callable[..., Any], new_doc: str
-            ) -> T:
+            def finalize(wrapper: Callable[..., Any], new_doc: str) -> T:
                 """Wrap the wrapped function using the wrapper and update the docstring.
 
                 Args: