diff --git a/packages/abstractions/kiota_abstractions/store/in_memory_backing_store.py b/packages/abstractions/kiota_abstractions/store/in_memory_backing_store.py
index fef8c809..34ece180 100644
--- a/packages/abstractions/kiota_abstractions/store/in_memory_backing_store.py
+++ b/packages/abstractions/kiota_abstractions/store/in_memory_backing_store.py
@@ -27,6 +27,7 @@ class InMemoryBackingStore(BackingStore[T], Generic[T]):
 
     def __init__(self) -> None:
 
+        self.__id = str(uuid4())
         self.__subscriptions: dict[str, Callable[[str, Any, Any], None]] = {}
         self.__store: dict[str, tuple[bool, T, Optional[_Collection]]] = {}
         self.__initialization_completed: bool = False
@@ -40,11 +41,13 @@ def is_initialization_completed(self) -> bool:
     @is_initialization_completed.setter
     def is_initialization_completed(self, value: bool) -> None:
         self.__initialization_completed = value
-        for key, (_, val, collection) in self.__store.items():
+        for key in list(self.__store):
+            _, val, collection = self.__store[key]
             if isinstance(val, BackedModel):
                 # forward the initialization status to nested BackedModel instances
                 val.backing_store.is_initialization_completed = value
             self._ensure_collection_size_is_consistent(key, val, collection)
+            _, val, collection = self.__store[key]
             self.__store[key] = (not value, val, collection)
 
     @property
@@ -110,7 +113,8 @@ def set(self, key: str, value: T) -> None:
                 if isinstance(item, BackedModel) and item.backing_store:
                     item.backing_store.is_initialization_completed = True
                     item.backing_store.subscribe(
-                        lambda prop_key, old_val, new_val: self.set(key, value)
+                        lambda prop_key, old_val, new_val: self.set(key, value),
+                        f"{self.__id}:{key}"
                     )
 
         self.__store[key] = value_to_add
diff --git a/packages/abstractions/tests/store/test_in_memory_backing_store.py b/packages/abstractions/tests/store/test_in_memory_backing_store.py
index dc08615a..60512002 100644
--- a/packages/abstractions/tests/store/test_in_memory_backing_store.py
+++ b/packages/abstractions/tests/store/test_in_memory_backing_store.py
@@ -228,3 +228,34 @@ def test_subscribers_get_previous_and_new_values():
     backing_store.set("name", "Samwel")
     backing_store.set("name", "Bill")
     assert changes == [("name", None, "Samwel"), ("name", "Samwel", "Bill")]
+
+def test_list_items_notify_the_store_once_per_change():
+    backing_store = InMemoryBackingStore()
+    colleague = MockEntity(id="2f8c9b8c-8ea0-46b2-9c6d-660c9b7bf6af")
+    backing_store.set("colleagues", [colleague])
+    backing_store.set("colleagues", [colleague])
+    changes = []
+    backing_store.subscribe(lambda key, old, new: changes.append(key))
+    for new_id in ("first", "second", "third"):
+        colleague.id = new_id
+    assert changes == ["colleagues"] * 3
+
+def test_list_item_shared_by_two_stores_notifies_both():
+    first, second = InMemoryBackingStore(), InMemoryBackingStore()
+    colleague = MockEntity(id="2f8c9b8c-8ea0-46b2-9c6d-660c9b7bf6af")
+    first.set("colleagues", [colleague])
+    second.set("colleagues", [colleague])
+    changes = []
+    first.subscribe(lambda key, old, new: changes.append("first"))
+    second.subscribe(lambda key, old, new: changes.append("second"))
+    colleague.id = "2fe22fe5-1132-42cf-90f9-1dc17e325a74"
+    assert changes == ["first", "second"]
+
+def test_completing_initialization_clears_a_resized_list():
+    backing_store = InMemoryBackingStore()
+    numbers = [1]
+    backing_store.set("numbers", numbers)
+    numbers.append(2)
+    backing_store.is_initialization_completed = True
+    backing_store.return_only_changed_values = True
+    assert not backing_store.enumerate_()