“Because you read it and substitute meaning for what you have been trained to think about it. “
That’s what I perceive you to be doing with it.
In 1 Cor. 11, you say there is a clear reference to Christ being actually present in the bread and wine. And there he is, actually serving the bread and the wine. He is bodily there, doing this.
And you say I am substituting meaning?
Indeed: "discerning the body of the Lord" is what 1 Cor. 11:29 admonishes us to be lest we are not taking the Holy communion "worthily". St. Paul would not be telling the Corinthians to "discern" something that was not there for them.
And there he is, actually serving the bread and the wine
That would be the scene of the Last Supper (Luke 22:7-23 and similar in other synoptics), not the discourse in 1 Cor. 11. Yes, at the Last Supper Christ was present both in His natural body celebrating the Eucharist and in His Eucharistic body and blood in the Last Supper meal. That is what Jesus Christ said, so I believe it. You should believe it too.