Joseph ran Egypt. He managed granaries, read dreams, survived prison, and fed a continent through seven years of famine. He knew how things were supposed to be done. So when he watched his father's right hand drift toward the head of the younger son, something in him recoiled.
Targum Pseudo-Jonathan describes it with restraint. Joseph saw the crossed hands, "and it was evil before him" (Genesis 48:17). He reached up, gently, to move his father's hand back where it belonged. Menasheh was the firstborn. The right hand belonged on Menasheh.
The moment is tender and revealing. Joseph is the son who rules nations, trying to correct the father who buries sons. He thinks in order; Jacob thinks in prophecy. Joseph sees a mistake; Jacob sees the future. The sages note that Joseph had spent his life as the younger son rising over the older. He should have known. But even a viceroy can forget, for a moment, that blessing does not obey birth order. Jacob will have to remind him.