core: remove the correct item from the item_pool in fill_restrictive

Fill.py

@@ -51,7 +51,10 @@ def fill_restrictive(world: MultiWorld, base_state: CollectionState, locations:
         items_to_place = [items.pop()
                           for items in reachable_items.values() if items]
         for item in items_to_place:
-            item_pool.remove(item)
+            for p, pool_item in enumerate(item_pool):
+                if pool_item is item:
+                    item_pool.pop(p)
+                    break
         maximum_exploration_state = sweep_from_pool(
             base_state, item_pool + unplaced_items)