The noted 19th century Protestant Heinrich Meyer observed that many of the early so-called Church Fathers like Augustine, Aquinas, and Ambrose reinterpreted John 17:3 from:
To….“You [i.e., Father are] the only true God”
To his credit Meyer called this “a perversion of the passage...running counter to the strict monotheism of John.” He added that “Only One, the Father, can absolutely be termed the only true God.” (Meyer's NT Commentary)“You [i.e., Father] and Jesus Christ, Whom you have sent, as the only true God.”