Nothing in sections 46:5-3 to 46:5-6 of this title contained shall be deemed to show an intent on the part of the legislature to determine that it was not, prior to July fourth, one thousand nine hundred and thirty-one, the law that a conveyance or instrument purporting to remise, release or quitclaim to the grantee therein was effectual to pass all the estate which the grantor could lawfully convey by deed of bargain and sale.