I loved the new thing one of the mojang employees recently added. Custom heads for all mobs! I had to try it! I put on the new version, just because it was new, and found a bug.

Whenever I hold or wear a head (any head in general, not just custom ones), my survival inventory (the survival section in the creative mode, and the only one in survival) would become invisible. I couldn't see my stuff! If I knew were the things were I could still move them around, but they were insible in my inventory