What are you signifying by the phrase, “His Beatific Vision?” The Beatific Vision, as I have always heard the term used, refers to the face-to-face vision of God beheld by the blessed in Heaven.
Are you perhaps referring to God’s Omniscience?
Anyway, Saint Thomas wrote,
"things which are not actual, are in the power either of God Himself or of a creature, whether in active power, or passive; whether in power of thought or of imagination, or of any other manner of meaning whatsoever. Whatever therefore can be made, or thought, or said by the creature, as also whatever He Himself can do, all are known to God, although they are not actual. And in so far it can be said that He has knowledge even of things that are not. "
Since God is omnipotent, then if He knows all the things that are in His power to make, He knows many, many things that are not actual. All of those things are contained in His omniscience. I’m not sure what to say about them being in His “Vision,” but if it strikes you as absurd, perhaps you are not thinking about it correctly.