Ambrosiaster and Transubstantiation

Q. Did Ambrosiaster advocate the Roman dogma of transubstantiation?

Ambrosiaster [Pseudo-Ambrose] (fl. c. 366-384 A.D.):

...we receive the mystic chalice as a type [in typum]... (In 1 Cor. II, 26) see (J.N.D. Kelly, Early Christian Doctrines, [1968], p. 446). Here

~ Soli Deo Gloria