All deeds and conveyances of lands within this commonwealth, made and executed, and duly recorded in the county where the lands therein conveyed lie, more than twenty-one years before the passage of this act, under the authority of any last will and testament, by the executor or executors thereof, the said will having been duly proved, and letters testamentary granted, as prescribed by the laws of the state of which the testator was a citizen at the time of his death, shall be held to have the same force and effect to pass and convey the estate that was in the testator at the time of his decease, and intended to be conveyed by the deed or conveyance, as if such will had been duly proved and letters testamentary granted within this commonwealth: Provided, That nothing herein contained shall affect the rights of parties to any suit now pending.