diff --git a/temporalio/worker/_workflow_instance.py b/temporalio/worker/_workflow_instance.py
index 11834778..004faa70 100644
--- a/temporalio/worker/_workflow_instance.py
+++ b/temporalio/worker/_workflow_instance.py
@@ -422,6 +422,8 @@ def activate(
                 continue
             i += 1
 
+        if seen_completion:
+            self._warn_if_unfinished_handlers()
         return self._current_completion
 
     def _apply(
diff --git a/tests/worker/test_workflow.py b/tests/worker/test_workflow.py
index d57e6b72..246a83e3 100644
--- a/tests/worker/test_workflow.py
+++ b/tests/worker/test_workflow.py
@@ -5632,53 +5632,6 @@ async def finish(self):
         self.workflow_may_exit = True
 
 
-@workflow.defn
-class UpdateCancellationWorkflow(CoroutinesUseLockWorkflow):
-    def __init__(self) -> None:
-        self.non_terminating_operation_has_started = False
-
-    @workflow.run
-    async def run(self) -> str:
-        await workflow.wait_condition(lambda: False)
-        return "unreachable"
-
-    @workflow.update
-    async def wait_until_non_terminating_operation_has_started(self) -> None:
-        await workflow.wait_condition(
-            lambda: self.non_terminating_operation_has_started
-        )
-
-    @workflow.update
-    async def non_terminating_operation(self) -> str:
-        self.non_terminating_operation_has_started = True
-        await workflow.wait_condition(lambda: False)
-        return "unreachable"
-
-
-async def test_update_cancellation(client: Client):
-    async with new_worker(client, UpdateCancellationWorkflow) as worker:
-        wf_handle = await client.start_workflow(
-            UpdateCancellationWorkflow.run,
-            id=str(uuid.uuid4()),
-            task_queue=worker.task_queue,
-        )
-        # Asynchronously run an update that will never complete
-        non_terminating_update_task = asyncio.create_task(
-            wf_handle.execute_update(
-                UpdateCancellationWorkflow.non_terminating_operation
-            )
-        )
-        print("wait until handler started...")
-        # Wait until we know the update handler has started executing
-        await wf_handle.execute_update(
-            UpdateCancellationWorkflow.wait_until_non_terminating_operation_has_started
-        )
-        print("cancel the workflow")
-        await wf_handle.cancel()
-        print("await non_terminating_update_task...")
-        await non_terminating_update_task
-
-
 async def _do_workflow_coroutines_lock_or_semaphore_test(
     client: Client,
     params: UseLockOrSemaphoreWorkflowParameters,