今天部分etf ef.stock.get_quote_history取不到历史行情

今天模拟盘指标计算出错，发现部分ETF取不到历史行情，只有今天的行情数据：如图：
调用单标发现只有今天的数据：

Start by reproducing the reported behavior with ef.stock.get_quote_history for the affected ETFs and compare the returned history with an ETF that works. Trace the data retrieval path from that entry point to identify where older records are lost. Done means affected ETFs return their expected historical行情 and the simulation indicator calculation succeeds.

Written by the indexing model from the issue text.