Have a reference to a prefab with a GameObjectEntity component on it. When I instantiate the plain ol' Object.Instantiate way it will only spawn one object. If there's one of those objects in the scene already it won't instantiate a new one. Seems like it adds an entity shown in the Entity Debugger correctly. If I use the approach used in the SpaceShooter example project with EntityManager.Instantiate, passing in my prefab, it spawns the right amount of entities at the right time in the Entity Debugger, but those entities don't have any components on them and of course it shows nothing in the scene. In a hybrid ECS scenario I haven't been able to find an example that can spawn a game object from a ComponentSystem that works for me.