Probably… honestly I don’t know, this is somewhat outside of the scope of the plugin itself: UE4 tears down everything between level loads, except when you use the “travel” method which moves an actor to another level and some actors can persist into the new level.
Generally it’s probably not a good idea to have any state persisted inside the WebView since none of it will exist between level loads or save/load games etc.
There are still parts of UE4 that I’m unfamiliar with and exactly what happens during level transitions is one of them, but I’m pretty sure all of your actors go away. I know there is a way of storing data persistently across level loads but you may not be able to do that purely from blueprints.