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Two OperatorIDPairs will be generated for each operator. When attempting to assign state to the first OperatorIDPair, the alternative ID cannot be matched, and we fallback to the generated ID, remove it from the localOperators list (the first bolded lineL15 below), and put it in the map for later task state assignment (the second bolded lineL23 below). When attempting to assign state to the second OperatorIDPair, the alternative ID still cannot be matched, and we fallback to the generated ID again. This time, we will get a null-valued operator state (as the actual value is removed before), and thus create an empty operator state and overwrite the map for later task state assignment. As a result, the state is lost.

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