Hi. This is a problem with Minecraft 14w25a snapshot and I wanted to test out the new mob, and the mob and everything works. But there's one problem with the graphics. Every block is invisible in parts of the world (but is completely solid and can be walked on, and functions as X-Ray in vanilla so it's not the world not loading fully). Same goes with water and lava (I haven't tried out lava, only water) and when I enter the water everything goes blue but the water is invisible. Mobs are not invisible, only some blocks. Mobs still interact with the environment as if it was completely visible (Squids and Guardians move/swim in the water, Sheep and Cows correctly interact with the overworld environment). I have included a picture of me on a invisible patch of grass blocks and how it functions as X-Ray (you can see all the caves underground and this is no Command Blocks, mods or texture packs).

Picture of this bug is attached in the attachments, look at it if you want better way of knowing what I am talking about. And if this is just me, then remind me what I did wrong.