Are banks unaware of sophomore internships?

I'm confused about if bank HR's are unaware that some people have sophomore IB internships or other internships that don't really give you time off. After talking with a bunch of banks about their summer 2019 timelines, some have stated that most of the superdays will be in the summer. I know this is somewhat unprecedented so are they just overlooking conflicts with jobs? Or are they expecting candidates to call in sick days and potentially forfeit return offers? Somewhat of a rant, I know, but just wanted to hear some other perspectives.