Java Edition 21w20a

{
 "title": "Minecraft 21w20a",
 "images": [
 "21w20a.jpg",
 "Java Edition 21w20a.png"
 ],
 "rows": [
 {
 "field": "''(link to Java Edition article, displayed as Java Edition)''",
 "label": "(link to Edition article, displayed as Edition)"
 },
 {
 "field": "May 19, 2021",
 "label": "Release date"
 },
 {
 "field": "(link to Snapshot article, displayed as Snapshot)",
 "label": "(link to Version types article, displayed as Type)"
 },
 {
 "field": "(link to Java Edition 1.17 article, displayed as 1.17)",
 "label": "Snapshot for"
 },
 {
 "field": "[https://piston-data.mojang.com/v1/objects/f756009979e33058d57695a3599b4a2544d856ca/client.jar Client] ([https://piston-meta.mojang.com/v1/packages/e8a53814450fd98c2d5de5eca8e89cf6760c89d2/21w20a.json .json])<br />[https://piston-data.mojang.com/v1/objects/054b2065dd63c3e4227879046beae7acaeb7e8d3/server.jar Server] <br />[https://piston-data.mojang.com/v1/objects/233aa01c6db99ffcf95594e384e72671ae279ced/CavesAndCliffsPreview.zip Data pack]",
 "label": "(link to Tutorial:Installing a version#Manual version installation article, displayed as Downloads)"
 },
 {
 "field": "[https://piston-data.mojang.com/v1/objects/e6bf5879f4ae3778540cf304483e035ef72416a3/client.txt Client]<br />[https://piston-data.mojang.com/v1/objects/8d6960e996a40b8350f5973d8a237469a9a6a7bc/server.txt Server]",
 "label": "(link to Obfuscation map article, displayed as Obfuscation maps)"
 },
 {
 "field": " <span style=\"font-size:smaller\"><abbr title=\"decimal\">dec</abbr>: </span>1073741852<br /> <span style=\"font-size:smaller\"><abbr title=\"hexadecimal\">hex</abbr>: </span>4000001C",
 "label": "(link to Protocol version article, displayed as Protocol version)"
 },
 {
 "field": "2715",
 "label": "(link to Data version article, displayed as Data version)"
 },
 {
 "field": "7",
 "label": "<span style=\"white-space: normal;\">(link to Pack format#List of pack formats article, displayed as Resource pack format)</span>"
 },
 {
 "field": "7",
 "label": "<span style=\"white-space: normal;\">(link to Pack format#List of pack formats article, displayed as Data pack format)</span>"
 },
 {
 "field": "<span class=\"plainlinks\">[https://en.wikipedia.org/wiki/Java_version_history#Java_SE_16 Java SE 16]</span>",
 "label": "<span style=\"white-space: normal;\">Minimum Java version</span>"
 }
 ],
 "invimages": [],
 "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 21w19a|◄  21w19a]]\n</td>\n<td style=\"padding: 0.4em\">''' 21w20a'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition 1.17 Pre-release 1| 1.17 Pre-release 1 ►]]\n</td>\n</tr>\n</table>"
}

21w20a is the twenty-second and final snapshot for Java Edition 1.17, released on May 19, 2021,^[1] which makes tweaks and fixes bugs, most of which relate to axolotl behavior and world generation issues.

NBT format

• Added HasVisualFire tag.
  • Entities with this tag visually appear on fire, even if they are not actually on fire.

Tags

• Added the features_cannot_replace block tag.
  • Contains bedrock, spawners, chests, and end portal frames.

Glow lichen

• Now drops the correct amount of glow lichen if there's multiple in one block space.

Rooted dirt

• Tilling rooted dirt with a hoe now converts it into dirt, and pops out hanging roots, to match the behavior in Bedrock Edition.^[2]

Structure block

• All invisible blocks are now displayed as small cubes by save mode structure blocks; previously barriers and light blocks would not display at all.^[3][4]
  • Variants of air still all appear identical and are not distinguished.^[5]

Big dripleaf

• Tweaked the inventory model.

Light block

• Changed the textures of inventory icons to prevent overlap with the stack number.

Axolotl

• 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.^[6]
• When fed with a bucket of tropical fish, it returns a water bucket instead of a bucket.

Llama

• No longer spit at players on Peaceful difficulty.

Amethyst geodes

• Are rarer.

Distance effects

• Fixed a precision loss issue with minecraft:location_check.^[7]

Narrator

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

Tags

• Added the cave_vines_plant block to the bee_growables block tag.
  • The cave_vines block was already in this tag.
• Removed the tropical fish item from the axolotl_tempt_items item tag.

Text

• Changed the strings "Chat disabled by launcher option, cannot send message" and "Chat not allowed by account settings, cannot send message" to "Chat disabled by launcher option. Cannot send message" and "Chat not allowed by account settings. Cannot send message", respectively.

Protocol

• While connecting to a server, the client sends a handshake packet with "hostname" and "port" field directly padded with address given in address text field directly, instead of converting them to the real hostname and port.

77 issues fixed

From released versions before 1.17

• MC-610 – Grass / Flowers / Snow are placed incorrectly in newly created chunks.
• MC-102220 – Barrier Blocks are not shown when "Show Invisible Blocks" is selected in Save Structure Blocks.
• MC-106613 – Shulker no longer continue close or open when it hurt in the peaceful mode.
• MC-125858 – Grass / flowers / snow / trees are placed incorrectly in Superflat World.
• MC-137452 – Bamboo grows in lots of inappropriate places in Bamboo Jungles.
• MC-149777 – Crash when loading world: java.util.ConcurrentModificationException when using Java 11 or above.
• MC-166187 – Some mobs still try to hit players in Peaceful.
• MC-172304 – Piglins, piglin brutes, hoglins, zoglins and axolotls can attack their own teammates.
• MC-189535 – Catching a fish in a bucket on creative mode doesn't give player new bucket.
• MC-191338 – Name color for Minecart with Command Block is incorrect.
• MC-192591 – Name color for Structure Void is incorrect.
• MC-197328 – Entities sometimes don't render behind the water surface on Fast or Fancy graphics.
• MC-198200 – Crash when leaving out processors in a template pool: java.lang.IllegalArgumentException: bound must be positive.
• MC-199702 – "netherrack_replace_blobs" of large size can cause inconsistent generation.
• MC-207324 – Mobs and particles sometimes don't fully render behind stained or tinted glass.
• MC-220694 – Name color for knowledge book is incorrect.
• MC-223322 – Chorus flowers can be broken with projectiles in spawn protection.

From the 1.17 development versions

• MC-203712 – Amethyst Geodes cause floating water/lava to generate when intersecting water/lava caves/pools.
• MC-203867 – Amethyst geodes can overwrite bedrock.
• MC-204393 – Lava Cauldron emits redstone signal strength 1 instead of 3.
• MC-204902 – Dirt paths are no longer compatible with the programmer art resource pack.
• MC-205104 – Rideable mobs are not affected by powder snow's freezing effect while being ridden.
• MC-205120 – Freezing hearts aren't displayed properly in Programmer Art resource pack.
• MC-205250 – Amethyst geodes can generate in a stronghold and can potentially destroy the end portal frames.
• MC-205680 – minecraft:location_check predicate floating point imprecision.
• MC-206107 – Parrots sitting on shoulders do not freeze in powder snow.
• MC-206131 – Amethyst blocks are transparent / don't conduct Redstone.
• MC-206601 – Potion particles are showing when looking through spyglass.
• MC-206839 – Pointed dripstones cause extreme durability damage to helmets.
• MC-207366 – Trying to modify the world height of a world after it's already been generated gives a null pointer exception.
• MC-208586 – Axolotls get stuck and spin constantly on top of lily pads.
• MC-208589 – Axolotls have a swimming animation (move their body up- and downwards) when on land.
• MC-208617 – Axolotls sometimes twitch rapidly when adjusting their rotation.
• MC-208624 – An axolotl is not correctly centered whilst inside of a boat.
• MC-208641 – Axolotl movement glitch on stairs.
• MC-208649 – Breeding axolotl with a bucket of tropical gives back a bucket instead of a water bucket.
• MC-208654 – Collecting an axolotl with a water bucket in creative mode replaces the original bucket.
• MC-208675 – Axolotls sometimes use walking animation when in shallow water.
• MC-208682 – Axolotls frequently get stuck inside of waterlogged blocks.
• MC-208691 – Axolotls play dead even when they take damage without being attacked by an entity.
• MC-208735 – Axolotls attempt to pathfind towards unreachable water, then start spinning, eventually drying out and dying.
• MC-209324 – Pointed Dripstone can be broken with tridents in spawn protection.
• MC-212125 – Only one glow lichen drops when using shears on multiple in a single block space.
• MC-212531 – Shulkers can rotate their heads up and down.
• MC-212931 – Fire extinguishing sound doesn't play when mobs are extinguished with rain/water.
• MC-214041 – Mob can't properly or difficult walk on big dripleaf, when the big dripleaf is 4 blocks or more from the ground.
• MC-214909 – Top half of a small dripleaf can turn into a ghost block when placing it in water while the water is being removed.
• MC-215665 – Amethyst Geodes can overlap with dungeons.
• MC-216214 – netherrack_replace_blobs with water as target crashes the game.
• MC-216980 – Comma splices in two source strings (EN_US).
• MC-217113 – Foxes spawned inside of powder snow sleeps.
• MC-217608 – The big dripleaf texture is not vertically centered.
• MC-217610 – Too much of the big dripleaf is hidden when placed inside of an item frame.
• MC-217742 – Campfires and TNT can be lit by players using arrows shot from flame bows in spawn protection.
• MC-219856 – F3 + L isn't sorted alphabetically in the debug screen.
• MC-219870 – The Mojang loading screen upon start up flashes black.
• MC-220063 – Sweet berries and glow berries sound events are named extremely differently.
• MC-220128 – Parity Issue: Rooted dirt won't turn into the dirt and drop roots item after tilling with hoe in Java.
• MC-220867 – Fossils can generate through bedrock.
• MC-221566 – Name color for light is incorrect.
• MC-221833 – Light blocks are not shown within structure block bounds with Show Invisible Blocks on.
• MC-221863 – Powder Snow can be broken by players on fire in spawn protection.
• MC-221984 – Collecting an axolotl in a bucket and then placing it resets its kill cooldown.
• MC-222002 – Light item displays the wrong level number.
• MC-222116 – Splash water bottles doesn't extinguish candle cakes.
• MC-222797 – Axolotl can be bred with just tropical fish items, not just bucket ones.
• MC-223371 – Powder snow can be destroyed through the use of a flame bow in spawn protection.
• MC-223372 – You can decrease the level of a water or powder snow cauldron, through the use of an entity on fire in spawn protection.
• MC-224320 – minecraft.used:minecraft.potion doesn't increase when filling a partially filled cauldron with a water bottle.
• MC-224322 – Powder snow can create ghost blocks in creative mode.
• MC-224480 – Powder snow doesn't melt into water in cauldrons.
• MC-224482 – Superflat presets no longer generate with decorations.
• MC-225078 – Upgrading from 1.12.2 and below will cause items to lose enchantments.
• MC-225253 – Dying in a nether portal softlocks the player on the "You Died!" menu.

From the previous development version

• MC-225347 – cave_vines_plant isn't in #bee_growables.
• MC-225352 – Geodes have not been made "significantly rarer".

Private issues

• MC-225360 – Cannot resolve SRV records: unknown host.