(a) In reviewing the procedures used in the adoption, amendment, or repeal of any plan or bylaw, no court shall invalidate the plan or bylaw or its amendment or repeal because of a failure to adhere to strict and literal requirements of this chapter concerning minor or nonessential particulars. The court shall uphold the plan, bylaw, or action if there has been substantial compliance with the procedural requirements of this chapter.
(b) No person shall challenge for purported procedural defects the validity of any plan or bylaw as adopted, amended, or repealed under this chapter after two years following the day on which it would have taken effect if no defect had occurred.