Java Edition 20w45a

20w45a is the first snapshot for Java Edition 1.17, released on November 4, 2020, which adds the first Caves & Cliffs features.

Blocks

 * Amethyst Bud
 * Budding Amethyst
 * Amethyst Cluster
 * Amethyst clusters grow from budding amethyst, which can be found inside geodes.
 * Clusters have four growth stages: small amethyst bud, medium amethyst bud, large amethyst bud, and amethyst cluster.
 * Clusters can only grow when they are placed on budding amethyst blocks.
 * Fully-grown amethyst clusters drop four amethyst shards (or more with Fortune) when an iron pickaxe or higher is used, and drop nothing otherwise when broken.
 * Clusters can be silk touched at any stage.
 * Block of Amethyst
 * Generates amethyst crystals on any of its sides, in a given time.
 * Unobtainable in survival.
 * Extremely rare, generates only in amethyst geode structures.
 * Block of Copper
 * Calcite
 * A whitish stone that generates in amethyst geodes, between tuff and the actual amethyst.
 * Candle
 * Comes with 16 dyed types and a non-dyed type.
 * Can be lit by any item that produce fire.
 * Up to 4 can be placed in a single block, similar to sea pickles.
 * Can be placed on cake.
 * Can be placed underwater, but will not be lightable.
 * Copper Ore
 * Cut Copper
 * Cut Copper Slab
 * Cut Copper Stairs
 * Lightning Rod
 * Tinted Glass
 * A variant of glass that does not let light pass through.
 * Tuff
 * A grayish stone that composes the outer layer of amethyst geodes.

Items

 * Amethyst Shard
 * Obtained from breaking amethyst clusters.
 * The amount dropped can be increased with the fortune enchantment.
 * Can be used to craft tinged glass, blocks of amethyst and a spyglass.
 * Bundle
 * Bundles are items that hold other items.
 * A bundle can hold a mixture of items, but only one stack’s worth. For example, a bundle could fit:
 * 64 dirt
 * 32 dirt + 32 stone
 * 32 dirt + 8 ender pearls
 * One of every color of wool, concrete, carpet and terracotta (64 blocks in total)
 * Or one diamond helmet
 * Use right-click to put an item into a bundle.
 * Right-click a bundle to empty it.
 * Copper Ingot
 * Spyglass

Blocks

 * Cauldrons
 * Can now be filled with lava.
 * Lava filled cauldrons give off a redstone signal of strength 1.
 * Grass Path
 * Renamed to "Dirt Path".
 * Can now be made on top of dirt, coarse dirt, mycelium, and podzol.
 * Pistons
 * Particles will now appear if a block is broken by a piston.
 * Rails
 * Are now waterloggable.
 * Water
 * Flowing water no longer breaks rails.

Items

 * Firework Rockets
 * Simple firework rockets with one gunpowder can now be crafted using the recipe book.

Entities

 * Experience Orbs
 * Will now sometimes merge when in large quantities, to improve performance.
 * Merging will not affect the amount of experience gathered from collecting the merged orbs.
 * Minecarts
 * Can now move in water.
 * Shulkers
 * If a shulker is hit by another shulker's bullet, it now has a chance of spawning a new shulker.