. . . . . . . . "???(a) Existing Rights, Duties, and Obligations.???This title [see Short Title of 1998 Amendment note set out above], including the amendments made by this title, does not affect the validity of any right, duty, or obligation of the United States or any other person arising under any contract, loan, or other instrument or agreement that was in effect on the day before the effective date of this ti" .