Problem while loading in Resources folder with a duplicated content

Hi, I've encountered a weird behavior, I don't know if it's a bug, anyway, I made a workaround but I still need to see with everyone if the first code was okay.

I've made two custom classes, "item" and an inherited one called "Equipment"
for both I can create directly the an equipment or item asset by right clicking onto the Project directory editor with the line
[CreateAssetMenu(fileName = "New Equipment", menuName ="Inventory/Equipment")]

these equipment files are stored in
Assets/Resources/items

now, I needed to list all the equipment into a list (fullItemList) in the rescue folder, with the following code :

Code (CSharp):

1.   foreach (Equipment itm in Resources.FindObjectsOfTypeAll(typeof(Equipment)))
2.         {
3.             fullItemList.Add(itm);
4.         }

Everything works fine, if I created let's say 10 equipment with the help of the context menu, if I call a fullItemList.Count I get 10.

BUT, if I make the mistake to duplicate directly (by Ctrl-D) an equipment asset in this very same folder, there everything breaks, and a fullItemList.Count could gave me a lowered number (like 3), depending on which equipment name was duplicated.
WORSE : even after deleting the duplicated asset and restarting unity, the list.count will stay the same (lower number version)
I have to delete all the assets after the duplicated one, and recreate all by context-menu to get everything in order.

So to counter this, I now use

Code (CSharp):

1.  string myPath = "Assets/Resources/items/";
2.         DirectoryInfo dir = new DirectoryInfo(myPath);
3.         FileInfo[] info = dir.GetFiles("*.asset");
4.         foreach (FileInfo f in info)
5.         {
6.             Debug.Log(f.Name);
7.             fullItemList.Add((Equipment)AssetDatabase.LoadAssetAtPath(myPath + f.Name, typeof(Equipment)));
8.         }

which works fine, even after duplicate my assets..

Look like a bug, or did I do something terribly wrong?

 

What type of collection is

fullItemList

?

 

it's a List<Equipment> fullItemList;

really everything's work fine, if I keep adding equipments assets by right clicking, the list will increase, but when I duplicate an equipment (and then changing the name and vars in it), there it goes nuts