Notwithstanding the provisions of § 15.2-3217, if a decision granting any motion or petition for annexation is subjected to collateral attack in any court, state or federal, the special court shall not be dissolved; or, if heretofore or hereafter dissolved at the time such attack is made or is pending, shall be revived. The court shall thereafter continue in existence for one year after all collateral issues have been resolved, and shall have the same powers and duties as set out in § 15.2-3217. In addition, it shall have the power to fully implement any order or decision of any court of competent jurisdiction with respect to such collateral attack.