Minecraft wiki entry for Metadata_variants, associated text: Cakes with six bites, while obtainable now, were never actually obtainable in the game during the time when these odd overeaten cakes existed. Cakes with seven bites were completely two-dimensional, and cakes with eight through fifteen bites appeared especially glitchy, proceeding to invert themselves, such that their textures would be visible only on the inside rather than the outside, and these textures would be borrowed from adjacent spots of the texture atlas currently in use. Their wireframe hitboxes would also visually extend in this direction, but they could actually be targeted only by aiming at the portion of that hitbox within the block the cake is really situated. Collision boxes for these are similarly odd.