diff --git a/src/backend/tests/test_task_loop_fields.py b/src/backend/tests/test_task_loop_fields.py
index 6814f9e..bb8f8ea 100644
--- a/src/backend/tests/test_task_loop_fields.py
+++ b/src/backend/tests/test_task_loop_fields.py
@@ -146,6 +146,8 @@ async def test_copy_on_write_carries_the_three_fields(
         value=10.0, pass_fail="pass", deviation=0.0, input_method="manual",
     ))
     await db_session.commit()
+    # sessione condivisa col client: la collezione version.tasks va riletta
+    db_session.expire_all()
 
     resp = await client.put(
         f"/api/tasks/{created['id']}", headers=auth_headers(maker_user),