It either has to be real...
or it's of no value.
Regarding the value of the Last Supper, my understanding of course.
Luke 22:14 And when the hour came, he reclined at table, and the apostles with him.
Luke 22:15 And he said to them, “
I have earnestly desired to eat this Passover with you before I suffer.
And the Church rightly took notice of Jesus
strong desire and made it an institution.
And so
as a remembrance I take the bread (a symbol of Jesus body, I am not a cannibal), thank Him for sacrificing his body of the cross -- and more things I am thankful for --
as a remembrance drink the wine (a symbol of Jesus shed blood for the forgiveness of my sins, I am not a vampire) -- and more things I am thankful for --
As such was the understanding of the churches I have visited in the last 50 years.