Java Edition 20w49a

20w49a is the fourth snapshot for Java Edition 1.17, released on December 2, 2020, which adds sculk sensors and the dripstone caves biome.

Blocks

 * Sculk sensor
 * A new redstone component.
 * Detects vibrations, and emits a redstone signal.
 * Will emit a different strength if connected to a comparator, and the signal strength is based on the vibration's frequency
 * Vibrations can be occluded using wool blocks.
 * Can only be obtained via the Creative inventory.

World generation

 * Dripstone caves
 * A new underground biome.
 * Made up of primarily dripstone blocks and stone, with large clusters of dripstone blocks hanging from the ceiling, pointed dripstone on the floor and ceiling and many pools of water.
 * Does not generate naturally in normal worlds, and can only be generated using buffet worlds with "Dripstone Caves" selected as the source biome, and even there the biome size is extremely small, compared to the announcement.

General

 * Tags
 * Added the block tag.
 * Contains the block tag and dirt.
 * Used in dripstone generation to determine what dripstone can replace and what pointed dripstone can generate on.
 * Added the block tag.
 * Contains the block tag.
 * Blocks in this tag will prevent sculk sensors from hearing vibrations if the block is between the sculk sensor and the vibration.
 * Added new tag type.
 * Added the game event tag.
 * Contains the step, falling, and shooting projectile events.
 * Game events in this tag will be ignored by sculk sensors if the source entity is sneaking.
 * Added the game event tag.
 * Contains every game event.
 * Game events in this tag will trigger sculk sensors.

Gameplay

 * Death messages
 * Added death messages for being skewered by a falling stalactite:
 * " was skewered by a falling stalactite"
 * " was skewered by a falling stalactite whilst fighting "

Items

 * Bundle
 * Bundle fullness is now always shown even if advanced tooltips are disabled.