diff --git a/src/openforms/registrations/contrib/objects_api/submission_registration.py b/src/openforms/registrations/contrib/objects_api/submission_registration.py
index d208006a0d..94fc379c57 100644
--- a/src/openforms/registrations/contrib/objects_api/submission_registration.py
+++ b/src/openforms/registrations/contrib/objects_api/submission_registration.py
@@ -400,12 +400,7 @@ def get_object_data(
             }
         )
 
-        variables_values = FormioData(
-            {
-                **dynamic_values,
-                **static_values,
-            }
-        ).data
+        variables_values = FormioData({**dynamic_values, **static_values})
 
         variables_mapping = options["variables_mapping"]
         record_data: dict[str, JSONValue] = {}