Except as provided in paragraph (5), and if the disposition shall not be otherwise expressly provided for by a tribal probate code approved under section
2205 of this title, if a devise other than a residuary devise of a trust or restricted interest in land or trust personalty fails for any reason, such interest shall become part of the residue and pass, subject to the provisions of subsection (b) of this section, to the other residuary devisees, if any, in proportion to their respective shares or interests in the residue.