Notwithstanding any judgment, decree or order of any court or tribunal or other authority to the contrary, where any power, authority or jurisdiction or any duty which the Administrator may exercise or discharge under any law in force in the Union territory of Chandigarh had been exercised or discharged by any officer or other authority before the commencement of this Act, such power, authority, jurisdiction or duty shall be deemed to have been validly and effectively exercised or discharged by such officer or other authority as if the provisions of sub-section (1) of section 3 were in force at all material times when such power, authority or jurisdiction was exercised or such duty was discharged and that officer or other authority had been specified as an officer or other authority by the Central Government or the Administrator in that behalf under the said sub-section, and accordingly, no suit or other proceeding shall be instituted, maintained or continued in any court or tribunal or before other authority on the ground that such officer or other authority was not competent to exercise such power, authority or jurisdiction or to discharge such duty.