The provisions of this Act shall not apply to the Osage Indians, nor to the Five Civilized Tribes, in Oklahoma. Where deeds to tribal lands in the Five Civilized Tribes have been or may be issued, in pursuance of any tribal agreement or Act of Congress, to a person who had died, or who dies before the approval of such deed, the title to the land designated therein shall inure to and become vested in the heirs, devisees, or assigns of such deceased grantee as if the deed had issued to the deceased grantee during life.