Any zoning ordinance, regulation, resolution, amendment or change, report, zoning map, or other zoning action enacted, adopted, made, or taken prior to April 29, 1977, by the County Council of Montgomery County or the County Council of Prince George's County, acting respectively as the district councils of the regional district, or by the Commission under any applicable laws, are approved, ratified, validated, and confirmed, notwithstanding any defect in the procedure followed in the enactment, adoption, making, or taking of such ordinance, regulation, resolution, amendment or change, report, zoning map, or other zoning action, or any failure strictly to conform to or comply with the procedure specified in the applicable laws; any zoning map amendment enacted by resolution prior to April 29, 1977, by the County Council of Montgomery County or the County Council of Prince George's County, acting respectively as the district councils of the regional district are hereby ratified, confirmed and validated.