Moreover, these members' alleged harm of wanting to purchase new brace-equipped firearms without agency interference does "not flow 'from the immediate effective date'" but rather from choosing to purchase but not register a qualifying device under the Final Rule. See Ctr. for Biological Diversity v. Regan, No. CV 21-119, 2023 WL 5437496, at *3 (D.D.C. Aug. 23, 2023) (addressing source of alleged loss). In any event, this Court issued an administrative stay and preliminary injunction for almost five months of the litigation, curing any potential prejudice arising from the procedural defect.