Catholic teachings are that the power to change bread and wine, into the actual flesh and blood of our Lord was passed on by the apostles, bishops and priest and “only” to those, by the power of the Holy Spirit, following the unbroken line of the apostles, bishops and priest, through ordination, and consecration of the Eucharist during the Mass, has this authority or power.
In the sixteenth century, Martin Luther and the Protestant Reformation, rejected this teaching of the Catholic Church.
Luther teachings were; although the bread is still bread and the wine still is wine, Jesus does become present along with the substance of the bread and wine; but Jesus is present only at the moment the bread and wine are received; not before or after.
AS you can see, Catholic’s and Protestant teaching are different and one of the grave matters that prevent our sharing Communion at weddings and funerals. this post is not intended to offend, just state the differences in beliefs. God Bless.