Properly set root parent before copying a command's binding

discord/app_commands/commands.py

@@ -757,8 +757,8 @@ class Group:
         self._children: Dict[str, Union[Command, Group]] = {}
 
         for child in self.__discord_app_commands_group_children__:
-            child = child._copy_with_binding(self) if not cls.__discord_app_commands_skip_init_binding__ else child
             child.parent = self
+            child = child._copy_with_binding(self) if not cls.__discord_app_commands_skip_init_binding__ else child
             self._children[child.name] = child
             if child._attr and not cls.__discord_app_commands_skip_init_binding__:
                 setattr(self, child._attr, child)

discord/ext/commands/cog.py

@@ -249,12 +249,12 @@ class Cog(metaclass=CogMeta):
         # Register the application commands
         children: List[Union[app_commands.Group, app_commands.Command[Self, ..., Any]]] = []
         for command in cls.__cog_app_commands__:
-            copy = command._copy_with_binding(self)
-
             if cls.__cog_is_app_commands_group__:
                 # Type checker doesn't understand this type of narrowing.
                 # Not even with TypeGuard somehow.
-                copy.parent = self  # type: ignore
+                command.parent = self  # type: ignore
+
+            copy = command._copy_with_binding(self)
 
             children.append(copy)
             if command._attr: