Whether the insurer's reconsideration of the challenged decision rendered the appeal moot.
Yes. Because the insurer annulled its own decision and resumed the investigation before the appeal proceedings were completed, the appeal had become without object and had to be removed from the roll.
Under Art. 53 para. 3 LPGA, the insurer may reconsider a contested decision before sending its response to the appellate authority. SUVA did so and thereby accepted the appeal.