mcpe 0.15.0 b3 and b2

in mcpe 0.15 build 3 and 2 why cant i spawn eggs like creepers husk etc. only cows ,sheep,chickens that wasnt here in 0.14.3 and when riding a horse its possible to get over a obstacle thats on it a seeling and your head gets stuck in the seeling and see black screen. thx for listining (My mobile isnt in the list so its Asus zenfone laser2)