If a defendant who was found under section 3 of this chapter to have had a substantial probability of attaining the ability to understand the proceedings and assist in the preparation of the defendant's defense has not attained that ability within six (6) months after the date of the:
the state institution (as defined in IC 12-7-2-184) or the third party contractor, if the division of mental health and addiction has entered into a contract for the provision of competency restoration services by a third party, shall institute regular commitment proceedings under IC 12-26.
IC 35-36-3-4