I'm almost certain it's going to turn into a love affair with deep questions - is she cheating? Well, on paper, no, but it's obviously more nuanced than that.
It is one thing to know “my husband goes to work, but there he simply doesn’t remember anything outside of work, and vice versa at home”, and another to see it for yourself and realizing “holy shit, this is actually just another entirely unrelated brand new person occupying the body of the husband i live and raise children with for half a day.”
Not even mentioning all the potential implications that might have crossed her mind after facing it in reality. That person is nothing like my husband in any way, where did that new person come from, were they just born out of nothing? Could they potentially unknowingly get switched with my husband outside of the workplace and what would that mean? What happens to that person if my husband quits the job?
I wonder also, did the innie take all of the good traits and the bad ones are... Gone, from the outie?