Chunky can render most blocks in Minecraft up to version 1.12.2. The oldest Minecraft version supported is Minecraft 1.2.1, in which the Anvil world format was introduced. Older versions of Minecraft use a different format that is not supported. In Minecraft 1.13, the world format changed again and Chunky does not yet support it.
Entities are currently not rendered by Chunky, and some special blocks can not be rendered either. Here is a list of all things that Chunky does not render: