As a Protestant with a fairly Lutheran understanding of the Lord’s Supper, my issue with Transubstantiation is NOT that it acknowledges the Real Presence of Jesus Churst, body and blood.
Rather in the distinction between substance and accidents, Transubstantiation requires an assumption of Aristotle’s philosophy of the nature of the world. Aristotelian philosophy was all the rage in the high Middle Ages when transubstantiation developed.
Aristotle is also alien to a scriptural world view.
Transubstantiation requires nothing more than faith. Jesus said it; hence it must be so.