After signing into Minecraft 1.9 I tried to create a new world in creative mode. When I signed in I noticed that all the chunks seemed to be cycling through almost every biome type. They didn't stop I had to shut down and delete the server. I started a couple others and it continued in those as well. I even attempted to log in to my old worlds as well and they were also unusable. I have attached a picture of the world midcycle where you can see through the chunks.