I just left the game and re-opened and I saw this monstrosity... btw I don’t play with resource packs

I found out about the new snap shot and started messing around in a creative world seeing what kind of differences there was, and then I left the game and re-join the world and saw this monstrosity of a creature... i’ve seen bugs like this in the past with resource packs but I didn’t use any global resources or packs in that world.