Java Edition 21w20a

21w20a is the twenty-second snapshot for Java Edition 1.17, released on May 19, 2021, which makes tweaks and fixes bugs, most of which relate to axolotl behavior and world generation issues.

General

 * Tags
 * Added NBT tag.
 * Entities with this tag visually appear on fire, even if they are not actually on fire.

Blocks

 * Invisible blocks
 * All invisible blocks are now displayed as small cubes by save mode structure blocks; previously barriers and light blocks would not display at all.


 * Rooted Dirt
 * Tilling rooted dirt with a hoe will now convert it into dirt, and pop out hanging roots, to match the behavior in Bedrock Edition.

Mobs

 * Axolotl
 * Axolotls will now only play dead when in water.
 * Can no longer be fed tropical fish, only buckets of tropical fish, as axolotls in real life eat live fish. This also brings it to parity with Bedrock Edition.
 * When fed with a bucket of tropical fish, it will return a water bucket instead of a bucket.


 * Llama
 * Llamas no longer spit at players in peaceful mode.

World generation

 * Amethyst Geodes
 * Geodes were made rarer.

General

 * Narrator
 * GUI narration now includes position and usage of hovered or focused element.