a. In any proceeding to vacate, modify or reopen a final judgment that is commenced more than thirty days after its rendition, (1) proceeding by motion instead of by petition or by petition instead of by motion, or (2) failure to verify the petition, or (3) incorrect service of process or the required notice is waived if the opposing party appears in the proceeding but does not immediately object thereto; and such defects are waived by any party in default who had actual notice of the proceeding.

b. In any proceeding to vacate, modify or reopen a judgment, whether by a motion, petition or application, jurisdictional grounds are not waived by being joined with nonjurisdictional grounds in the motion, petition or application or by raising nonjurisdictional defenses in an accompanying pleading.