ValueError: The name datetime occurs multiple times, use a level number

[Yuhang-Harry-Gao]

仅在workflow中将Alpha158改成Alpha360后，「prediction, backtest & analysis」环节出现ValueError: The name datetime occurs multiple times, use a level number

[EnjoyLeole]

Similar problem, when use:
analysis_position.rank_label_graph(positions, label_df)

It was caused in line 171, qlib/contrib/report/analysis_position/parse_position.py

_position_df = parse_position(position)

This generate dataframe with multiindex ['instruments','datetime']

if calculate_label_rank:
    _position_df = _calculate_label_rank(_position_df)

Dataframe transfer to multiindex ['datetime','instruments','datetime'] , and caused the above error

Droplevel could fix it:
_position_df = _position_df.droplevel(level=0, )