Fix names of scenes dropped onto viewport

editor/plugins/canvas_item_editor_plugin.cpp

@@ -5852,7 +5852,7 @@ bool CanvasItemEditorViewport::_create_instance(Node *parent, String &path, cons
 
 	instantiated_scene->set_scene_file_path(ProjectSettings::get_singleton()->localize_path(path));
 
-	editor_data->get_undo_redo().add_do_method(parent, "add_child", instantiated_scene);
+	editor_data->get_undo_redo().add_do_method(parent, "add_child", instantiated_scene, true);
 	editor_data->get_undo_redo().add_do_method(instantiated_scene, "set_owner", editor->get_edited_scene());
 	editor_data->get_undo_redo().add_do_reference(instantiated_scene);
 	editor_data->get_undo_redo().add_undo_method(parent, "remove_child", instantiated_scene);

editor/plugins/node_3d_editor_plugin.cpp

@@ -4127,7 +4127,7 @@ bool Node3DEditorViewport::_create_instance(Node *parent, String &path, const Po
 		instantiated_scene->set_scene_file_path(ProjectSettings::get_singleton()->localize_path(path));
 	}
 
-	editor_data->get_undo_redo().add_do_method(parent, "add_child", instantiated_scene);
+	editor_data->get_undo_redo().add_do_method(parent, "add_child", instantiated_scene, true);
 	editor_data->get_undo_redo().add_do_method(instantiated_scene, "set_owner", editor->get_edited_scene());
 	editor_data->get_undo_redo().add_do_reference(instantiated_scene);
 	editor_data->get_undo_redo().add_undo_method(parent, "remove_child", instantiated_scene);