Provided always, that, subject and without prejudice to the powers of disposition given by this Act to the Commissioner acting in the execution of any such fiat as aforesaid, under which a person being, or before obtaining his certificate becoming, an actual tenant in tail of lands of any tenure, or a tenant in tail entitled to a base fee in lands of any tenure shall be adjudged a bankrupt, and also subject and without prejudice to the estate in such lands which may be vested in the assignees of the bankrupt’s estate, and also subject and without prejudice to the rights of all persons claiming under the said assignees in respect of such lands or any of them, such actual tenant in tail, or tenant in tail so entitled as aforesaid shall have the same powers of disposition under this Act in regard to such lands as he would have had if he had not become bankrupt.