Always use ItemDataService, as we can't do the instanceof check

Author: Intybyte

src/main/java/io/github/thebusybiscuit/slimefun4/api/items/SlimefunItem.java

@@ -1210,14 +1210,8 @@ public final int hashCode() {
             return null;
         }
 
-        if (item instanceof SlimefunItemStack stack) {
-            return getById(stack.getItemId());
-        }
-
         Optional<String> itemID = Slimefun.getItemDataService().getItemData(item);
-
         return itemID.map(SlimefunItem::getById).orElse(null);
-
     }
 
     /**