Java Edition 21w44a

21w44a is the eighth snapshot for Java Edition 1.18, released on November 3, 2021.

World generation

 * Old worlds upgrading
 * New world generation is now inserted under existing chunks when upgrading a world to the new world height.

Gameplay

 * Weather
 * Sleeping now only resets the weather cycle if it was raining.

General

 * JFR profiling
 * If it is started from an external source, the JFR events for network packets are now aggregated instead of one event per packet.


 * Simulation distance
 * Blocks and fluids are now also affected.


 * General
 * Optimized entity collisions.