Java Edition 18w21a

{
 "title": "Minecraft 18w21a",
 "images": [
 "18w21a.jpg",
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 "field": "May 23, 2018",
 "label": "Release date"
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 {
 "field": "(link to Snapshot article, displayed as Snapshot)",
 "label": "(link to Version types article, displayed as Type)"
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 {
 "field": "(link to Java Edition 1.13 article, displayed as 1.13)",
 "label": "Snapshot for"
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 {
 "field": "[https://piston-data.mojang.com/v1/objects/9b1d1486518585537a0d9e608dd27e3946880d48/client.jar Client] ([https://piston-meta.mojang.com/v1/packages/7cdac8c7c494291a01f151a5dc146f38a70c4a2b/18w21a.json .json])<br />[https://piston-data.mojang.com/v1/objects/2022a23da58dc55371b6a182fb1ba59742dc66a2/server.jar Server]",
 "label": "(link to Tutorial:Installing a version#Manual version installation article, displayed as Downloads)"
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 {
 "field": "378",
 "label": "(link to Protocol version article, displayed as Protocol version)"
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 {
 "field": "1495",
 "label": "(link to Data version article, displayed as Data version)"
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 {
 "field": "4",
 "label": "<span style=\"white-space: normal;\">(link to Pack format#List of pack formats article, displayed as Resource pack format)</span>"
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 {
 "field": "4",
 "label": "<span style=\"white-space: normal;\">(link to Pack format#List of pack formats article, displayed as Data pack format)</span>"
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 {
 "field": "<span class=\"plainlinks\">[https://en.wikipedia.org/wiki/Java_version_history#Java_SE_8_.28LTS.29 Java SE 8]</span>",
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 "invimages": [],
 "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" >[[Java Edition 1.12.2|<span style=\"margin-right:-0.35em\">◄</span>◄  1.12.2]]</td>\n<td style=\"padding: 0.4em\">'''[[Java Edition 1.13|1.13]]'''</td>\n<td style=\"padding: 0.4em\" >[[Java Edition 1.13.1| 1.13.1 <span style=\"margin-right:-0.35em\">►</span>►]]</td>\n</tr>\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\">\n[[Java Edition 18w20c|◄  18w20c]]\n</td>\n<td style=\"padding: 0.4em\">''' 18w21a'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition 18w21b| 18w21b ►]]\n</td>\n</tr>\n</table>"
}

18w21a is the thirty-eighth snapshot for Java Edition 1.13 released on May 23, 2018^[1].

NBT format

• Added the TreasurePosX, TreasurePosY, TreasurePosZ, GotFish, and CanFindTreasure tags for dolphins.

Settings

• New option in options.txt: mouseWheelSensitivity
  • Defaults to 1.0
  • Affects sensitivity of mouse wheel in-game

Mobs

• Dolphins now lead the player to treasures: when they are fed raw cod, they swim to the nearest shipwreck or underwater ruins if they can find one within their search radius.
• Mob yaw (left-right) head movement is now smooth.

NBT format

• The ench tag is now called Enchantments, and no longer has number IDs in each compound.

General

• Added (and fixed) item rarity colored tooltips for certain items:

29 issues fixed

From released versions before 1.13

• MC-52974 – Host's skin not visible to other players when in LAN world.
• MC-72866 – Item shading inside item frames does not account for rotation.
• MC-97196 – /spreadplayers shows wrong error message / large number in error message when no entities were spread.
• MC-105139 – Entity head rotation not interpolating on Yaw axis.
• MC-116877 – Collision checking during Block placement only uses default state

From the 1.13 development versions

• MC-122369 – Village center is offset
• MC-122428 – Fire spread too quick
• MC-123199 – Lighting renders incorrectly on item frames oriented vertically.
• MC-123454 – Dispenser using spawn egg spawns mob too high.
• MC-123455 – Using spawn egg spawns mob too high on the water and lava.
• MC-123598 – Fence top missing texture when below fence gate.
• MC-123773 – Weird scrolling behavior starting in 18w01a
• MC-124954 – Jungle temple redstone wire is not connected.
• MC-125377 – Structures from old worlds don't regenerate if opened with 1.13 standalone client/server.
• MC-126086 – Salmon and tropical fish hitbox on land is wrongly positioned.
• MC-126863 – Sounds made with water in spectator mode.
• MC-127116 – When placing a wall using /setblock without specifying a block state, it is invisible; default state has up=false.
• MC-127305 – Crash when creating a debug world
• MC-127333 – Carpet and panes don't show the right colors on maps.
• MC-127474 – Waterloggable blocks retain their waterlogged state when moved with pistons or slime blocks
• MC-127586 – Mobs do not suffocate in double slabs.
• MC-127996 – Bone meal can be put on floating water.
• MC-128139 – Sea grass generates water source when placed on flowing water.
• MC-128251 – Grass and mycelium can spread to dirt blocks which are submerged under general water.
• MC-128493 – Dolphins can wear armor.
• MC-129058 – Dolphins become permanent (can't despawn) after playing with an item.
• MC-129708 – Armor slot icons are backwards.

From the previous development version

• MC-129808 – demo.day.6 does not include the keybinding correctly.
• MC-129849 – Upgrade from 1.6.4 destroys world, spams errors.

• This snapshot was released on World Turtle Day.