Leftover

The leftover is a joke block introduced in Java Edition 20w14∞ that forms the "zones" in the "zones" dimension.

Obtaining
The leftover cannot be obtained as an item even by using the command. The leftover can be placed using commands such as or, and naturally generates in the "zones" dimension. It cannot be destroyed by tools or explosions.

Natural generation
Leftovers naturally generate in the "zones" in the "zones" dimension, forming areas of danger throughout the overworld-like environment.

Usage
The leftover is non-solid, and invisible apart from emitting "Happy Villager" particles. An entity entering it is inflicted by Blindness II and  Poison IV for 3 seconds each. It is not possible for other blocks to be placed inside of a leftover, nor can pistons move or destroy it. When an item is thrown into it, it affects the gravity of the item.

Gallery
Sobra