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MultiDictProxy returns incorrect values when key not in multiple keys

MultiDictProxy returns incorrect values when key not in multiple keys: a task in harbor-swesmith-rl-artifacts: Harbor SWE-Smith 强化学习数据产物 (Harbor dataset). When accessing a key through MultiDictProxy that is not in multiple keys , the proxy returns unexpected wrapped values instead of the original…

The task

When accessing a key through MultiDictProxy that is not in `multiple_keys`, the proxy returns unexpected wrapped values instead of the original data.

Part of keryszhan/harbor-swesmith-rl-artifacts.