If a planning scheme is amended under section 19 , section 20 , section 21 or section 22 , then, despite any provision of the Land Use Planning and Approvals Act 1993 or of the planning scheme –

(a) the amendment of the planning scheme is not to be taken to be invalid by reason only that –

(i) the planning scheme has not been amended in the manner, or following the procedure that, but for this Act, would have been required to be followed under the planning scheme or the Land Use Planning and Approvals Act 1993 ; or

(ii) but for this Act, the amendment of the planning scheme would be in contravention of that Act; and

(b) a use or development of the land that is in accordance with the planning scheme as amended is not to be taken to be in contravention of section 63 of the Land Use Planning and Approvals Act 1993 .