'updated_at' field is None for all updates when requested inside a item query

A query as below returns None for the updated_at field.

query {
    complexity {
        query
    }
    items(ids: [''' + ", ".join(item_ids) + ''']limit: 100) {
        id
        name
        updates{
            id
            updated_at
            created_at
            creator {
                name
            }
        }
    }
}

Below is the example of the response. It returns None for the ‘updated_at’ field.

{'data': {'complexity': {'query': 147},
  'items': [{'id': '5819716479',
    'name': 'AAA',
    'updates': [{'id': '2919516548',
      'updated_at': None,
      'created_at': '2024-02-29T05:22:16Z',
      'creator': {'name': 'XXX'}},
     {'id': '2883433180',
      'updated_at': None,
      'created_at': '2024-02-22T05:14:13Z',
      'creator': {'name': 'XXX'}},
     {'id': '2659876831',
      'updated_at': None,
      'created_at': '2024-01-09T14:35:26Z',
      'creator': {'name': 'XXX'}}]}]},
 'account_id': 16259805
}

The query above has been working well for a while but several days ago this problem just emerged.

If I query the update separately as below, it just returns the updated_at value correctly.

query {
    complexity {
        query
    }
    updates (ids: [''' + ", ".join(update_ids_new) + ''']limit: 1000) {
        body
        id
        updated_at
        created_at
        creator {
            name
            id
        }
    }
}

I think this is a bug. Do anybody know about this problem?

Hello there @JSK and welcome to the community!

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Cheers,
Matias