Every suit hereafter brought to enforce personal liability of an owner of real property for taxes assessed against such real property by any political subdivision shall be commenced within five years after the date such taxes become due and not thereafter: Provided, however, That actions brought under the provisions of subsection (c) of section 21 of the act of May 25, 1945 (P.L. 1050), known as the “Local Tax Collection Law,”¹ may be commenced within one year of the discovery of the conveyance giving rise to the action without regard to the date of the conveyance.