I just looked it up online and they say the bees would most likely be hungry.
This was suggested:
'They are starving and desperate.
Put out a bucket of 4 c soybean flour, 1 c brewers yeast, 1/2 tsp salt, 1 tsp powdered vitamin C sifted together; the bees will go nuts for it'
The corn doesn't hurt the chickens, so doubt it is bad. And, the bees are not eating it, they ate unable to pick it up. Actually, the bees are not really accomplishing anything. They're just rubbing in it.