Don’t most modern cars, even ICE cars, both slow-down-to and speed-up-to the speed designated by cruise control? I know my Subaru does, and my old Audi did, and both of the two Ford Escapes I drive for work do.
In my 2016 Subaru BRZ (manual transmission), cruise control would never apply brakes, so if the hill was steep enough that engine breaking was slowing the car, then it could potentially exceed the cruise speed. But it would need a nearly 10% grade to do that in 6th gear at 60 mph.