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{{Infobox version
|title=Minecraft 18w20a
|image=18w20a.jpg
|image2=Java Edition 18w20a.png
|edition=Java
|type=Snapshot
|date=May 15, 2018
|clienthash=89843d397a9b0fd42bea26ada6890ebc693ad288
|jsonhash=a64998fc7679c161aa9dd671bec77329dd68e2cc
|serverhash=108a051216637e0145f6b0e66182b48736595fc3
|parent=1.13
|prevparent=1.12.2
|nextparent=1.13.1
|prev=18w19b
|next=18w20b
}}<onlyinclude>

'''18w20a''' is the thirty-fifth [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.13]], released on May 15, 2018<ref>{{snap|18w20a|id=b|May 15, 2018}}</ref>.

== Additions ==
'''Command format'''
* Teams can now have a prefix and a suffix, specified as [[Minecraft:Raw JSON text format|raw JSON text]].
** {{command|team option <team> prefix <prefix>}}
** {{command|team option <team> suffix <suffix>}}

== Changes ==
=== Blocks ===
* Changed IDs of several [[Minecraft:block]]s:
{| class="wikitable" data-description="Changed block IDs"
! Old ID !! New ID
|-
| <code>kelp_top</code> || <code>kelp</code>
|-
| <code>kelp</code> || <code>kelp_plant</code>
|-
| <code>prismarine_bricks_slab</code> || <code>prismarine_brick_slab</code>
|-
| <code>prismarine_bricks_stairs</code> || <code>prismarine_brick_stairs</code>
|}

* Changed names of several blocks:
{| class="wikitable" data-description="Changed block names"
! Old name !! New name
|-
| Weighted Pressure Plate (Heavy) || Heavy Weighted Pressure Plate
|-
| Weighted Pressure Plate (Light) || Light Weighted Pressure Plate
|-
| Prismarine Bricks Slab || Prismarine Brick Slab
|-
| Prismarine Bricks Stairs || Prismarine Brick Stairs
|}

=== Items ===
* Changed IDs of several [[Minecraft:item]]s:
{| class="wikitable" data-description="Changed item IDs"
! Old ID !! New ID
|-
| <code>kelp_top</code> || <code>kelp</code>
|-
| <code>kelp</code> || <code>kelp_plant</code>
|-
| <code>cod_mob_spawn_egg</code> || <code>cod_spawn_egg</code>
|-
| <code>salmon_mob_spawn_egg</code> || <code>salmon_spawn_egg</code>
|}

* Changed names of several items:
{| class="wikitable collapsible collapsed" data-description="Changed item names"
! Old name !! New name
|-
| Gold Horse Armor || Golden Horse Armor
|-
| Chain Helmet || Chainmail Helmet
|-
| Chain Chestplate || Chainmail Chestplate
|-
| Chain Leggings || Chainmail Leggings
|-
| Chain Boots || Chainmail Boots
|-
| Milk || Milk Bucket
|-
| Seeds || Wheat Seeds
|-
| Spawn Bat || Bat Spawn Egg
|-
| Spawn Blaze || Blaze Spawn Egg
|-
| Spawn Cave Spider || Cave Spider Spawn Egg
|-
| Spawn Chicken || Chicken Spawn Egg
|-
| Spawn Cod || Cod Spawn Egg
|-
| Spawn Cow || Cow Spawn Egg
|-
| Spawn Creeper || Creeper Spawn Egg
|-
| Spawn Dolphin || Dolphin Spawn Egg
|-
| Spawn Donkey || Donkey Spawn Egg
|-
| Spawn Drowned || Drowned Spawn Egg
|-
| Spawn Elder Guardian || Elder Guardian Spawn Egg
|-
| Spawn Enderman || Enderman Spawn Egg
|-
| Spawn Endermite || Endermite Spawn Egg
|-
| Spawn Evoker || Evoker Spawn Egg
|-
| Spawn Ghast || Ghast Spawn Egg
|-
| Spawn Guardian || Guardian Spawn Egg
|-
| Spawn Horse || Horse Spawn Egg
|-
| Spawn Husk || Husk Spawn Egg
|-
| Spawn Llama || Llama Spawn Egg
|-
| Spawn Magma Cube || Magma Cube Spawn Egg
|-
| Spawn Mooshroom || Mooshroom Spawn Egg
|-
| Spawn Mule || Mule Spawn Egg
|-
| Spawn Ocelot || Ocelot Spawn Egg
|-
| Spawn Parrot || Parrot Spawn Egg
|-
| Spawn Phantom || Phantom Spawn Egg
|-
| Spawn Pig || Pig Spawn Egg
|-
| Spawn Polar Bear || Polar Bear Spawn Egg
|-
| Spawn Pufferfish || Pufferfish Spawn Egg
|-
| Spawn Rabbit || Rabbit Spawn Egg
|-
| Spawn Salmon || Salmon Spawn Egg
|-
| Spawn Sheep || Sheep Spawn Egg
|-
| Spawn Shulker || Shulker Spawn Egg
|-
| Spawn Silverfish || Silverfish Spawn Egg
|-
| Spawn Skeleton || Skeleton Spawn Egg
|-
| Spawn Skeleton Horse || Skeleton Horse Spawn Egg
|-
| Spawn Slime || Slime Spawn Egg
|-
| Spawn Spider || Spider Spawn Egg
|-
| Spawn Squid || Squid Spawn Egg
|-
| Spawn Stray || Stray Spawn Egg
|-
| Spawn Tropical Fish || Tropical Fish Spawn Egg
|-
| Spawn Turtle || Turtle Spawn Egg
|-
| Spawn Vex || Vex Spawn Egg
|-
| Spawn Villager || Villager Spawn Egg
|-
| Spawn Vindicator || Vindicator Spawn Egg
|-
| Spawn Witch || Witch Spawn Egg
|-
| Spawn Wither Skeleton || Wither Skeleton Spawn Egg
|-
| Spawn Wolf || Wolf Spawn Egg
|-
| Spawn Zombie || Zombie Spawn Egg
|-
| Spawn Zombie Horse || Zombie Horse Spawn Egg
|-
| Spawn Zombie Pigman || Zombie Pigman Spawn Egg
|-
| Spawn Zombie Villager || Zombie Villager Spawn Egg
|}

=== Non-mob entities ===
* Changed the name of [[Minecraft:lightning bolt]]:
{| class="wikitable" data-description="Changed Lightning Bolt name"
! Old name !! New name
|-
| Bolt of Lightning || Lightning Bolt
|}

=== General ===
* Players in Creative mode can now sleep even if monsters are nearby.
* Many internal IDs and data values have been changed, such as [[Minecraft:texture]] and [[Minecraft:structure]] files.

== Fixes ==
{{fixes|fixedin=18w20a|prefix=Minecraft
|;old
| 9620 |F1 and open chat makes hotbar appear.
| 116928 |Command block and spawner minecart data fixer not working correctly.
|;dev
| 121743 |Feedback of some commands uses OS locale for formatting decimal numbers.
| 122331 |Shield with banner has broken colors.
| 122428 |Fire doesn't disappear / Fire spread too quick.
| 123136 |Vines placed against the ceiling and the wall are not upgraded correctly.
| 123224 |Levers placed on the ground and ceiling rotate when upgrading.
| 123466 |Scheduled block updates are lost when upgrading a world from 1.12.2.
| 123589 |Inconsistent texture renaming.
| 123790 |<code>"italic":false</code> in custom item names does not make name non-italic.
| 124065 |Spawn Egg Data Loss on 1.7.10 -> 1.13 Upgrade.
| 124112 |Renamed placed droppers lose their custom name when upgrading from 1.12.2.
| 124203 |Right clicking adult skeleton horse or mule with spawn egg does not spawn baby.
| 124343 |Command block minecart data walker never runs due to comparing different types.
| 124496 |Debug Stick text is not translated in other languages.
| 124998 |Command block minecarts disappear upon reloading the world.
| 125091 |Bonemeal doesn't place flowers on plains biome.
| 125092 |Bonemeal stops placing plants after placing flower.
| 125182 |Block Entities are not upgraded properly when upgrading from 1.12.2.
| 125307 |When a trident hits a mob, it will not fall right below it.
| 125310 |Trident can penetrate the closed shulker / wither / ender dragon / invulnerable mobs.
| 125342 |Trident cannot destroy the armor stand.
| 125362 |Attribute modifier tooltips use OS locale.
| 125408 |Loyalty tridents return to spectators (but don't get picked up).
| 125625 |Glass panes, fences, iron bars and cobblestone walls sometimes fail to upgrade
| 125799 |Chests placed in earlier versions make no sound when opened.
| 125919 |Tridents enchanted with channeling will work in the end during a thunderstorm under certain conditions.
| 126034 |The name of prismarine brick slab and stairs is not consistent with other brick slabs and stairs.
| 126241 |Crash on World Load - ''Skyblock 2.1 Vanilla''.
| 126300 |Unlike sword, trident can accidentally break blocks in creative mode.
| 126373 |Density of nether and overworld ore blobs significantly lower in 18w versions.
| 126796 |Tropical fish are disappearing.
| 126883 |Shulkers becomes dark purple when upgrading from 1.12.2.
| 127027 |Squid's ink clouds appear to render/spawn sideways or lopsided.
| 127250 |Drowned Chicken Rider is invincible and doesn't attack player.
| 127252 |Killing the Drowned mob doesn't count towards the Monster Hunter/Monsters Hunted advancements.
| 127301 |Shipwrecks always face north.
| 127478 |Texture metadata parsing fails if animation block is not present.
| 127730 |Fish have a strange shadow.
| 127993 |Solid blocks placed on unhydrated farmland.
| 128013 |Player can walk on the water with slow falling effect.
| 128125 |When swimming within bottom stairs or slabs, the water shader does not appear.
| 128472 |When swimming, the player can stand up even though there is a block above.
| 128495 |Igloos often fail to generate completely.
| 128615 |Cod and salmon loot table have redundant <code>set_count</code> function.
| 128851 |The "A Furious Cocktail" advancement does not require Resistance.
| 129236 |Swimming Sometimes Doesn't Work
| 129244 |Lava uses the water texture on multiplayer
| 129281 |Player's position, gamemode, inventory, effects gets reset to an older point upon re-entering a worldsave
|;previous
| 129371 |Loading previous buffet worlds into 18w19b turns it into a default world type
}}
'''Other fixes'''
* Worlds created in 18w16a can also now be opened.</onlyinclude>

== Videos ==
{{slicedlime|xT00mu_iaHU}}

== Trivia ==
* Unlike most of the first-of-the-week snapshots, this was released on a Tuesday instead of Wednesday.

== References ==
{{reflist}}

== Navigation ==
{{Navbox Java Edition versions|1.1x}}

[[Minecraft:de:18w20a]]
[[Minecraft:es:Java Edition 18w20a]]
[[Minecraft:fr:Édition Java 18w20a]]
[[Minecraft:ja:Java Edition 18w20a]]
[[Minecraft:nl:18w20a]]
[[Minecraft:pt:Edição Java 18w20a]]
[[Minecraft:ru:18w20a (Java Edition)]]
[[Minecraft:zh:Java版18w20a]]

Minecraft:Java Edition 18w20a - Revision history

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