No Person claiming under any Deed, Instrument, or Assurance which shall be made or purport to be made under the Powers hereinbefore contained shall be bound to inquire whether the Provisions of this Act have been duly complied with or not, or whether the Transaction to which such Deed, Instrument, or Assurance shall relate has been in fact authorized by this Act or not, or whether it has or has not been within the Provisions and the true Intent and Meaning of this Act, but every such Deed, Instrument, or Assurance shall, when enrolled in the Manner herein-after provided, be good, valid, and effectual as against the Duke of Cornwall for the Purposes for which the same shall have been executed.