I have created a bee farm in the nether and it worked for a while until one time when i went in and there was no honey in the hives and no bees going in and out. Breaking one hive let 3 bees out which all seemed to have pollen on there backs. The hives still create sounds with bees in them but there is no activity that i can see. I moved the bees to the end and it still hasn't worked.