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Hello! I am honored to be able to contribute to the LangChain project for the first time. - **Description:** Using `RunnablePassthrough` logic without providing `chat_history` key will result in nested keys in `question`, so I submit a pull request to resolve this issue. I am attaching a LangSmith screenshot below. This is the result of the current version of the document. <img width="1112" alt="image" src="https://github.com/langchain-ai/langchain/assets/12846075/f0597089-c375-472f-b2bf-793baaecd836"> without `chat_history`: <img width="1112" alt="image" src="https://github.com/langchain-ai/langchain/assets/12846075/5c0e3ae7-3afe-417c-9132-770387f0fff2"> - **Lint and test**: <img width="777" alt="image" src="https://github.com/langchain-ai/langchain/assets/12846075/575d2545-3aed-4338-9779-1a0b17365418">
LangChain Documentation
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