Adding up on what @MostHost_LA already clarified, here two more elements for you to consider.
Get All Actors of Class is a node meant to be used in the Begin Play to feed dedicated arrays (like spawn points and the like).
You are not supposed to use that node for actors spawned at runtime. What one does for tracking collections of runtime-spawned actors is implement a Pub-Sub logic so that there is always up-to-date knowledge of all classes created during the game as needed.
BTW, if also the level-defined objects register themselves using the Pub-Sub pattern, one doesn’t need to call that node at all 