strange behaviour when creating and deleting objects with tags

hi. i am observing a very strange behavior in my project. not sure, if i am just missing something or it is a bug.

I am creating GameObjects at runtime and give them tags.

GameObject currGarage = new GameObject (); currGarage.tag = "Garage";

later, i create a list and add objects with this tag to the list:

 GameObject[] garageArray = GameObject.FindGameObjectsWithTag ("Garage");
 
         foreach(GameObject g in garageArray) {
             if(g != null) {
                 allGarages.Add(g);
             } else {
                 Debug.Log("object null");
             }
         }

then, at some point, i delete all objects in this list:

 foreach (GameObject g in appLogic.garageManager.allGarages) {
                     g.SetActive(true);
                     Destroy (g);
                 }

after that i create again some new GameObjects with that tag and write them into a new array:

 GameObject[] garageArray = GameObject.FindGameObjectsWithTag ("Garage");

now i have an array of the size of all Gameobjects with that tag ever created. even if i delete objects, unity keeps referencing them.

Am i doing something wrong? Or is it normal behaviour? I just want the "fresh" objects, without references to the destroyed ones...

someone knows more about this issue?