Going to assume you are not changing the visibility of the world or the camera and you’re not destroying any of them as well. Perhaps memory or graphic issues are to blame? Without any real sense of your blueprints and/or a video showcasing the problem, it would be rather hard to determine what could possibly cause the whole world to vanish while you are playing with an object. Unless something in that part of the object’s blueprint is doing something to the effect of the first line of this post.