String Evaluation with labelled criteria Scoring is wrong

### Checked other resources - [x] I added a very descriptive title to this issue. - [x] I used the GitHub search to find a similar question and didn't find it. - [x] I am sure that this is a bug in LangChain rather than my code. - [x] The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package). - [x] I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS. ### Example Code ```python evaluator = load_evaluator(EvaluatorType.LABELED_CRITERIA, llm=llm, criteria=param_criteria) eval_result = evaluator.evaluate_strings( prediction=param_prediction, input=param_input, reference=param_reference ) return eval_result ``` ### Error Message and Stack Trace (if applicable) ### Reasoning `{'reasoning': 'Step-by-step reasoning:\n\n1. Understand the user objective: \n The objective is to "Set the flight dates for any dates which has 5 days of difference in departure and return dates." \n The expected steps are: \n - Select a date in the departure date picker \n - Select a date in the return date picker \n\n2. Analyze the actual steps performed in the submission: \n - "Close the login popup" \n - "Click on the return date field to open the date picker." \n - "Click on 10th July 2025 to select the return date." \n\n3. Check if the submission fulfills the objective: \n - The submission only interacts with the return date picker and selects a return date. \n - There is no mention or action related to selecting a departure date. \n - The objective requires setting both departure and return dates with a 5-day difference. \n - The submission does not set the departure date at all, so it is incomplete. \n\n4. Check correctness and factual accuracy: \n - The steps performed are factually correct actions but incomplete relative to the objective. \n - Closing the login popup is not part of the objective but may be a prerequisite; …