diff --git a/pydantic_settings/sources.py b/pydantic_settings/sources.py
index cfbbac08..c8a198d1 100644
--- a/pydantic_settings/sources.py
+++ b/pydantic_settings/sources.py
@@ -1996,7 +1996,7 @@ def _metavar_format_recurse(self, obj: Any) -> str:
             return '...'
         elif isinstance(obj, Representation):
             return repr(obj)
-        elif isinstance(obj, typing_extensions.TypeAliasType):
+        elif isinstance(obj, typing.ForwardRef) or _is_type_alias_type(obj):
             return str(obj)
 
         if not isinstance(obj, (typing_base, WithArgsTypes, type)):
@@ -2009,9 +2009,12 @@ def _metavar_format_recurse(self, obj: Any) -> str:
         elif lenient_issubclass(obj, Enum):
             return self._metavar_format_choices([val.name for val in obj])
         elif isinstance(obj, WithArgsTypes):
+            if hasattr(obj, '__qualname__'):
+                obj_qualname = obj.__qualname__
+            else:
+                obj_qualname = str(obj).replace('typing.', '').replace('typing_extensions.', '').split('[')[0]
             return self._metavar_format_choices(
-                list(map(self._metavar_format_recurse, self._get_modified_args(obj))),
-                obj_qualname=obj.__qualname__ if hasattr(obj, '__qualname__') else str(obj),
+                list(map(self._metavar_format_recurse, self._get_modified_args(obj))), obj_qualname=obj_qualname
             )
         elif obj is type(None):
             return self.cli_parse_none_str
@@ -2432,3 +2435,17 @@ def _get_alias_names(
 
 def _is_function(obj: Any) -> bool:
     return isinstance(obj, (FunctionType, BuiltinFunctionType))
+
+
+# _TYPE_ALIAS_TYPES is copied from `pydantic._internal._typing_extra`.
+_TYPE_ALIAS_TYPES: tuple[type[typing_extensions.TypeAliasType], ...] = (typing_extensions.TypeAliasType,)
+if sys.version_info >= (3, 12):
+    _TYPE_ALIAS_TYPES = (*_TYPE_ALIAS_TYPES, typing.TypeAliasType)
+
+
+def _is_type_alias_type(tp: Any, /) -> typing_extensions.TypeIs[typing_extensions.TypeAliasType]:
+    """
+    Return whether the provided argument is an instance of `TypeAliasType`.
+    Copied from `pydantic._internal._typing_extra`.
+    """
+    return isinstance(tp, _TYPE_ALIAS_TYPES)