thats kinda weird. ever since this update (Unless they did it as a sneaky server-side patch after around 12(PM, local) today, my experience doesn't suggest it. Still had to go into the market twice to have the cargo register as I was offloading earlier for a Coriolis.
do you think it possible you could have some connectivity issues causing a bit more mayhem on the cargo transfer communication?
i can imagine slower/more loaded connection could still cause the same problem despite the optimisation in that patch...