If you place a hopper under a bee hive or bee nest and then harvest that bee hive using a dispenser, the hopper only picks up 10-30% of the drops. Instead, the honeycomb or honey bottles shoot out the sides in all directions and end up in the wrong place. Currently, making a lossless bee farm involves surrounding the entire area with hoppers, but the expected behaviour is that a hopper under a bee hive should pick up the resources harvested from the hive every time.