Java Edition 1.15.1

1.15.1 is an upcoming minor update to Java Edition with no set release date, which will fix bugs from 1.15.

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.