Excepting sharers in estates under butwarrah who may have saved their shares from sale under Sections XXXIII and XXXIV Regulation XIX. 1814, and sharers with whom the Collector, under Sections X and Xl of this Act, has opened separate accounts, any recorded or unrecorded proprietor or co-partner, who may purchase the estate of which he is proprietor or co-partner; or who by re-purchase or otherwise may recover possession of the said estate, after it has been sold for arrears under this Act; and likewise any purchaser of an estate sold for arrears or demands other than those accruing upon itself; shall by such purchase acquire the estate subject to all its encumbrances existing at the time of sale and shall not acquire any rights in respect to under-tenants or ryots, with were not possessed by the previous proprietor at the time of the sale of the said estate.