Java Edition 21w17a

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 "field": " <span style=\"font-size:smaller\"><abbr title=\"decimal\">dec</abbr>: </span>1073741849<br /> <span style=\"font-size:smaller\"><abbr title=\"hexadecimal\">hex</abbr>: </span>40000019",
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 "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" >[[Java Edition 1.16.5|<span style=\"margin-right:-0.35em\">◄</span>◄  1.16.5]]</td>\n<td style=\"padding: 0.4em\">'''[[Java Edition 1.17|1.17]]'''</td>\n<td style=\"padding: 0.4em\" >[[Java Edition 1.17.1| 1.17.1 <span style=\"margin-right:-0.35em\">►</span>►]]</td>\n</tr>\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\">\n[[Java Edition 21w16a|◄  21w16a]]\n</td>\n<td style=\"padding: 0.4em\">''' 21w17a'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition 21w18a| 21w18a ►]]\n</td>\n</tr>\n</table>"
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21w17a is the nineteenth snapshot for Java Edition 1.17, released on April 28, 2021,^[1] which tweaks the textures of raw metal blocks, adds noodle caves and fixes bugs.

Tags

• Added the small_dripleaf_placeable block tag.
  • Contains clay and moss blocks.
  • Small dripleaf can be placed on blocks in this tag.

Changes have been made to the official Caves & Cliffs world generation preview data pack, which gives early access to the world generation coming in Java Edition 1.18.

Noodle caves

• A thinner, squigglier, tighter variant of spaghetti caves.
• These are an improved version of the mesh caves announced around Minecraft Live.

Amethyst cluster

• Removed unused 'lit' blockstate.

Blocks of raw metal

• Tweaked the textures of raw iron blocks, raw copper blocks, and raw gold blocks.

Copper ore and deepslate copper ore

• Now drops 2–3 raw copper when mined, or more when using a tool enchanted with Fortune.

Deepslate coal ore and deepslate copper ore

• Now can spawn naturally.

Block of copper

• Is now crafted from 9 copper ingots, instead of 4.

Hanging roots

• Can now be waterlogged, to match the behavior in Bedrock Edition.^[2]

Small dripleaf

• Can now also be placed on moss blocks.

Wither

• Is now immune to freezing.

Ore

• Emerald ore can now replace granite, andesite, diorite, tuff, and deepslate upon generating.
• If coal ore or copper ore replace tuff or deepslate, they become their deepslate variants.

Recipe book

• The recipe for crafting mossy stone bricks from moss blocks or vines is now unlocked with moss blocks or vines, respectively, rather than mossy cobblestone.
• The recipes for dyed candles are now grouped.
• The recipes for smelting and blasting ores into their respective materials are now grouped by ore type (i.e. smelting coal ore and deepslate coal ore are grouped).
  • For iron, gold, and copper, the recipes for smelting and blasting their raw materials into ingots are also grouped with their respective ore smelting and blasting recipes.
• The recipes for crafting copper ingots from copper blocks and waxed copper blocks are no longer grouped.^[3]
• The recipes for mossy stone bricks are now grouped, as are the recipes for mossy cobblestone.
• Many of the waxed copper block recipes were grouped together.

Tags

• Added the wither to the freeze_immune_entity_types entity type tag.

Changes have been made to the official Caves & Cliffs world generation preview data pack, which gives early access to the world generation coming in Java Edition 1.18.

Ore veins

• Snake veins are now slightly rarer and slightly smaller.
• Ores are clumpier and less evenly distributed.
• Now have a chance to rarely contain raw metal blocks.

22 issues fixed

From released versions before 1.17

• MC-170443 – Banner copying recipe ignores existence of other items in crafting grid.
• MC-187664 – World border uses float to determine its size, making some border sizes inaccessible, and cannot be set to 30 million or beyond.
• MC-197805 – Minecraft crashes every time when attempt to craft something (caused by BungeeCord or Paper).
• MC-201269 – Constantly teleporting player to a phantom crashes the game/kicks the player.

From the 1.17 development versions

• MC-203570 – Candles aren't grouped in the recipe book.
• MC-203745 – Repeated teleport between dimensions causes the entity to duplicate on the client.
• MC-204031 – Waxed Cut Copper (any level of weathered) have two separate recipes in the recipe book.
• MC-214187 – Void platform generates multiple times.
• MC-214735 – Horse disappears when dying while riding it and reloading the world while it's unloaded.
• MC-214838 – Big dripleaf stem remains after breaking a stem or leaf above it.
• MC-214865 – Floating islands world type generates extreme terrain.
• MC-219155 – Fishing line only starts on half distance between the fishing rod and bobber (Apple M1 only).
• MC-219840 – You cannot unlock the recipe for Mossy Stone Bricks.
• MC-219842 – Recipes for mossy cobblestone and mossy stone bricks aren't grouped.
• MC-220033 – (Parity issue) Hanging Roots can't be waterlogged.
• MC-221560 – Copper/Coal Ore in Deepslate Patches aren't Deepslate Ores.
• MC-222008 – Empty/missing template pool error grammar mistake.
• MC-222107 – sounds/mob/goat/pre_ram3.ogg missing from entity.goat.prepare_ram sound event.
• MC-222520 – Raw and Ore smelting previews aren't grouped together.
• MC-223055 – Amethyst buds and cluster have an unused blockstate.
• MC-223792 – Shrinking world border with center past x/z = 29999983 crashes the game.

From the previous development version

• MC-224029 – Fishing line becomes increasingly thinner the closer to the rod it gets on some devices.