Java Edition 1.15.1 Pre-release 1

1.15.1 Pre-release 1 (known as 1.15.1-pre1 in the launcher) is the first pre-release for Java Edition 1.15.1, released on December 12, 2019.

Changes

 * Performance
 * Optimized chunk rendering performance, especially for chunks with many different block states.
 * Network handling
 * Improved network handling of invalid biome IDs.

Fixes

 * Other


 * Fixed an error that was spammed to the game's log files caused by custom spawner blocks spawning villagers.
 * Fixed a crash that occurred in the Realms screen.