Augustine of Hippo

Knowledge of the miracle was conveyed to them indirectly. Other ships had come to the place where they had eaten bread; in these they went after Him; Howbeit there came other boats from Tiberias, nigh unto the place where they did eat bread, after that the Lord had given thanks. When the people therefore saw that Jesus was not there, neither His disciples, they also look shipping, and came to Capernaum, seeking for Jesus.

Catena Aurea by Aquinas ↗

Bede

The mystical meaning is, that the conventicles of heretics are without the company of Christ and His disciples. And other ships coming, is the sudden growth of heresies. By the crowd, which saw that Jesus was not there, or His disciples, are designated those who seeing the errors of heretics, leave them and turn to the true faith.

Catena Aurea by Aquinas ↗

Thomas Aquinas

887 It was the arrival of other boats from the opposite side of the sea that gave the people the opportunity to look for Christ; they could cross on these and search for him. He says: But other boats arrived, from the other side, that is, from Tiberias, near the place where they had eaten the bread, after having given thanks to God. These other boats signify the various sects of heretics and of those who seek their own profit, and not the good of Jesus Christ: "You seek me... …

Commentary on John ↗