Mob Spawn Eggs

I Have no idea which Snapshot, made this bug but, when you spawn a mod on a side of a block, 2 or blocks higher, the mob stays in mid-air, for about half a second. The mob is responsive during the time its in mid-air. The head turns, it reacts to the environment, and if holding a item in hand, like wheat or carrots for a pig. Please fix this Bug!