backtest occur errror while executor's time_per_step=1day

🐛 Bug Description

To Reproduce

__benchmark = "SH000300"

portfolio_analysis_config = {
    "strategy": {
        "class": "TopkDropoutStrategy",
        "module_path": "qlib.contrib.strategy",
        "kwargs": {
            "signal": '<PRED>',
            "topk": 50,
            "n_drop": 5,
        },
    },
    "executor": {
        "class": "SimulatorExecutor",
        "module_path": "qlib.backtest.executor",
        "kwargs": {
            "time_per_step": "1day",
            "generate_portfolio_metrics": True,
        },
    },
    "backtest": {
        "start_time": "2017-01-01",
        "end_time": "2020-08-01",
        "account": 100000000,
        "benchmark": __benchmark,
        "exchange_kwargs": {
            "limit_threshold": 0.095,
            "deal_price": "close",
            "open_cost": 0.0005,
            "close_cost": 0.0015,
            "min_cost": 5,
        },
    },
}

class WorkflowTest(TestCase):

    def setUp(self):
        super().setUp()

        provider_uri = "~/.qlib/qlib_data/cn_data"
        qlib.init(provider_uri=provider_uri, region=REG_CN)

        self.__my_prefix = 'my_'
        self.__rec_start_param = {'resume': True,
                                  'experiment_name': f"{self.__my_prefix}experiment",
                                  'recorder_name': f"{self.__my_prefix}recorder"}

        self._pkl_model = f"{self.__my_prefix}model.pkl"
        self._pkl_dataset = f"{self.__my_prefix}dataset.pkl"

    def test_backtest(self):
        with R.start(**self.__rec_start_param):
            recorder = R.get_recorder()

            pred = R.load_object('pred.pkl')
            placehorder_value = {"<PRED>": pred}
            pa_config = fill_placeholder(portfolio_analysis_config, placehorder_value)

            par = PortAnaRecord(recorder=recorder, config=pa_config)
            par.generate()

errors:

  File "/python3.12/site-packages/qlib/backtest/report.py", line 116, in _cal_benchmark
    raise ValueError(f"The benchmark {_codes} does not exist. Please provide the right benchmark")
ValueError: The benchmark ['SH000300'] does not exist. Please provide the right benchmark

DeBUG this method qlib.utils.resam.get_higher_eq_freq_feature()，Found that the method was called twice, the first time freq=day and the second time freq=1day`

Start with qlib.utils.resam.get_higher_eq_freq_feature(), which the report says receives both day and 1day, and inspect qlib/backtest/report.py at _cal_benchmark(). Run the supplied backtest using SimulatorExecutor with time_per_step set to 1day and benchmark SH000300. Done means the benchmark is found and the run no longer raises the reported ValueError.