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When converting a String to a type with a lifetime annotation in serde_json, one issue that can arise is the possibility of the data exceeding the lifetime of the value it is being assigned to. This can result in a borrow checker error, as Rust will not allow the data to outlive the scope it was assigned to. Another issue could be errors in deserialization due to incorrect types or data formats, which can lead to unexpected behavior or program crashes. Additionally, converting a String to a type with a lifetime annotation may require additional error handling and validation to ensure that the data is properly formatted and compatible with the target type.