If, after a juvenile court grants guardianship, a party becomes aware that a condition of consent to the guardianship may not be fulfilled: the party promptly shall: file notice with the juvenile court; give notice to all of the other parties; and if consent was received from a governmental unit or person who is not a party, give notice to that unit or person; the juvenile court shall schedule a hearing to occur within 30 days after the filing of the notice; and if the party, unit, or person whose condition cannot be fulfilled fails to enter into a new consent, the juvenile court shall: set aside the guardianship order; set the case in for a prompt trial on the merits of the guardianship petition; and reopen the CINA case for review as required under Title 3, Subtitle 8 of the Courts Article.