(a) Amendments to the subdivision and land development ordinance shall become effective only after a public hearing held pursuant to public notice in the manner prescribed for enactment of a proposed ordinance by this article. In addition, in case of an amendment other than that prepared by the planning agency, the governing body shall submit each such amendment to the planning agency for recommendations at least 30 days prior to the date fixed for the public hearing on such proposed amendment. If a county planning agency shall have been created for the county in which the municipality proposing the amendment is located, then, at least 30 days prior to the hearing on the amendment, the municipality shall submit the proposed amendment to said county planning agency for recommendations.

(b) Within 30 days after adoption, the governing body of a municipality, other than a county, shall forward a certified copy of any amendment to the subdivision and land development ordinance to the county planning agency or, in counties where no planning agency exists, to the governing body of the county in which the municipality is located.