As an aside, whenever I see brood cells with dead larvae/pupae, especially if they are in an area that is not surrounded by other capped brood, I always like to investigate a little further. Why were those cells alone in that area and not cleaned up? What caused their death? If I see perforated cappings on those cells I have an even bigger reason to check them out.
It sounds like simple starvation but a test costs nothing but a toothpick.
Stuff like these pics always has me looking.
Whenever something doesn't look right, check it out. A toothpick is cheap. These hives below looked absolutely healthy and yet a toothpick and a few cells made a big difference. Anything dead should be easy to check.
Don't freak out, yours starved, I'm just saying check to be sure nothing else was there.