Java Edition 21w06a

21w06a is the ninth snapshot for Java Edition 1.17, released on February 10, 2021, which adds new cave generation and a new build height limit.

World generation

 * Caves
 * Added new noise caves.

General
The Max height limit raised to 384 blocks.
 * World

New 'spaghetti' and 'cheese' caves

'Spaghetti' caves are long noodle-like caves

'Cheese' caves are like holes in swiss cheese

Trivia

 * This version cannot be launched in any version or snapshot before 21w06a.