"Master, when did you get here?" (John 6:26).
All of the Gospels were written after the fact, so the evangelists know the whole story and often mix later events into the middle of the narrative. The Jesus we meet in John 6 is both the historical Jesus and the risen Christ. Details like the miraculous appearance of Jesus walking on the lake are no doubt post-resurrection encounters filled with meaning for the early church.
Jesus' dialogue with the crowds who want to know when (and how) he got to the other side of the lake when he did not cross in the boat with the disciples is also a post-resurrection exchange between the church and its rabbinic critics.
Jesus tells them they are looking for him not because they believe in him but because they are hungry for earthly bread. In other words, like Nicodemus in earlier Gospel readings, they are still thinking in worldly terms and not spiritually.
John's references to bread are about the multiplication stories that link Jesus to Moses and the gift of manna in the desert, but they are also about the Eucharist. It is at their eucharistic gatherings that the early church communities are meeting the risen Christ in the scriptures and in the breaking of the bread. The Jesus John is testifying to in his Gospel is this Jesus, risen and glorified, revealing himself to his followers some 70 years after the life, death and resurrection of the historical Jesus.
So this Gospel is for us. We meet the same risen Christ when we gather at the Eucharistic Table that they knew at the end of the first century. This is Jesus Christ, yesterday, today and forever redeeming the world, generation by generation, toward the ultimate revelation at the end of history of God's plan for all of creation.