Here is a question and some thoughts hopefully to gain a better understanding.
Possible Scenario: An agency failed to exercise an option to extend the period of performance and the contract expired in January, in June the contractor and the Agency agree bilaterally to a modification to re-establish and continue originally planned work under the contract to the original option period of performance completion date of December of the year. The contract was initially award as valid contract against a Broad Agency Announcement and is for Basic Research (Budget Activity 1/2/3).
Thought