Your project might have things referenced from that plugin marked save game tag.
The plugin will try to auto respawn any object that is that scope list. If you don’t have a clear plan of which object classes you want auto respawn then it’s better to leave as is since that’s a very advanced deep control of the save system.
Usually if you want a class to auto respawn on load (UObject class) it should be a child of that default class in settings.