CCC 366 teaches that every soul is immediately created by God and not produced by the parents.
The Church teaches that every spiritual soul is created immediately by God - it is not "produced" by the parents
CCC 365 states that soul and body are not two separate aspects of man but form an inseparable unity
in man, are not two natures united, but rather their union forms a single nature.
CCC 404 says that original sin is transmitted by propagation, through the parents, of a deprived human nature
Adam and Eve committed a personal sin, but this sin affected the human nature that they would then transmit in a fallen state. It is a sin which will be transmitted by propagation to all mankind, that is, by the transmission of a human nature deprived of original holiness and justice.
If human nature is an inseparable unity of body and soul and, if original sin is passed through a deprived human nature, then it must be concluded that, in human nature both body and soul are equally deprived. If God immediately creates each soul, what is it's state at the moment of it's creation: Is it A) created already deprived or does it B) share equally in the deprivation of the flesh once united with it?
If A, which I doubt will be the answer, then original sin is imparted to the soul at creation rather than inherited.
If B then it is actually the flesh only that transmits original sin.
Is there a third logical option that this question is missing?