With a modification to a parenting plan, is the old one dissolved?

My husband went back to court and got a modification to the parenting plan. The new plan does not specify some of the things that the old one did, so does it revert back to the old plan for the issues that the new one does not address? For example: the old parenting plan specified which parent had the child on their birthdays, the modified one does not address birthdays at all. So does the old plan still apply in areas where the new one does not address?With a modification to a parenting plan, is the old one dissolved?
Jello is correct in both areasWith a modification to a parenting plan, is the old one dissolved?
to answer your bold question....NO





to answer your detail question...YES