Sec. 6. A former prosecution is not a bar under section 3, 4, or 5 of this chapter if:
(1) it was before a court that lacked jurisdiction over the defendant or the offense;
(2) it was procured by the defendant without the knowledge of the prosecuting authority and with intent to avoid a more severe sentence that might otherwise have been imposed; or
(3) it resulted in a conviction that was set aside, reversed, vacated, or held invalid in a subsequent proceeding, unless the defendant was adjudged not guilty or ordered discharged.