Ghost Slime Possess Mapmakers!

I was making a DinnerBunny, (Bunny made of skeletons, watch SwimmingBird941's video on it to check it out (https://www.youtube.com/watch?v=TWJv3kLoqLw)) But without ANYTHING on top, i made a slime riding the dinnerbone skeleton. It was invisible. When i punch it, my screen goes like the sky, and i only see SOME #'s of the items in my hotbar. Please fix as soon as possible.