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{{Infobox version
| title = Minecraft 23w42a
| image = 23w42a.jpg
| image2 = Java Edition 23w42a.png
| edition = Java
| type = Snapshot
| date = October 18, 2023
| jsonhash = 456ef8d0b5c09453a116cdafa94bbe31946919fd
| clienthash = f187037d38f503ede8c593521b4ea33ce27d2373
| clientmap = 3c4e5ebb21c2ed066bd80cf7f078abc88f331a2c
| serverhash = b5f423ba1c4191d133c0284a2b1b36da46f8b5f8
| servermap = 26d8b312ea92aa6a896181c0382c3ecac9fc3235
| parent = 1.20.3
| prevparent = 1.20.2
| prev = 23w41a
| next = 23w43a
| nextparent = 1.20.4
}}<onlyinclude>

'''23w42a''' is the third [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.20.3]], released on October 18, 2023,<ref>{{snap|23w42a|October 18, 2023}}</ref> which adds the "[[Minecraft:Java Edition 1.21|Update 1.21]]" experimental toggle and fixes bugs.

== Additions ==
=== General ===
'''[[Minecraft:Experiments]]'''
* Added the "[[Minecraft:Java Edition 1.21|Update 1.21]]" experimental toggle (<code>update_1_21</code> data pack).

'''[[Minecraft:Game rule]]'''
* Added <code>playersNetherPortalDefaultDelay</code> to control time (in [[Minecraft:game tick]]s) that a player needs to stand in a [[Minecraft:Nether portal]] before changing dimensions, while in Survival and Adventure mode. Defaults to <code>80</code>.
* Added <code>playersNetherPortalCreativeDelay</code> to control time (in game ticks) that a player needs to stand in a Nether portal before changing dimensions, while in Creative mode. Defaults to <code>1</code>.
* Added <code>projectilesCanBreakBlocks</code>, to control whether impact projectiles destroy blocks that are destructible by them (i.e. [[Minecraft:chorus flower]]s and [[Minecraft:decorated pot]]s), and to control whether [[Minecraft:trident]]s destroys [[Minecraft:pointed dripstone]]s. Defaults to <code>true</code>.

'''[[Minecraft:Loading screen]]'''
* Added a new screen for handling corrupted level files.
** It gives the player the option to restore a backup, and a quick link to the bug tracker for reporting a bug about it.

'''[[Minecraft:Options]]'''
* Added "Hide Splash Texts" in accessibility options, which allows the [[Minecraft:splash]] in the main menu to be hidden.

'''<samp>[[Minecraft:options.txt]]</samp>'''
* Added <code>hideSplashTexts</code>, defaults to <code>false</code>.

'''[[Minecraft:Particles]]'''
* Added new <code>white_smoke</code> particle type.

== Changes ==
=== Blocks ===
'''[[Minecraft:Decorated pot]]'''
* Now appears in the "Redstone" tab of the Creative inventory.

=== General ===
'''[[Minecraft:Custom structure]]'''
* Changes to structure type definitions (<code>data/minecraft/worldgen/structure</code>):
** Added optional <code>pool_aliases</code> list to jigsaw structures.
** Aliases represent the possibility to rewire jigsaw pool connections by redirecting pool references on individual structure instances.
** Alias variants are represented in <code>type</code> and is one of:
*** <code>direct</code>: 1:1 mapping from an alias to a new pool.
**** <code>alias</code>: Pool to replace.
**** <code>target</code>: Pool to replace with.
*** <code>random</code>: 1:n mapping where a pool from <code>n</code> is randomly selected for the structure instance.
**** <code>alias</code>: Pool to replace.
**** <code>targets</code>: Randomized list of candidate pools to replace <code>alias</code> with.
*** <code>random_group</code>
**** <code>groups</code>: Each group is a randomized list of above alias types.
**** Only one group is selected per structure instance.
**** This enables modelling selections such as "if pool X is replaced with X1, also replace pool Y with Y1".

'''[[Minecraft:Data pack]]'''
* The [[Minecraft:pack format]] version is now <code>21</code>.
* Added <code>white_smoke</code> particle definition.
* Renamed field {{nbt|short|Fuse}} to {{nbt|short|fuse}} on [[Minecraft:TNT]] entity.

'''[[Minecraft:Entity format]]'''
* In NBT format for entity type <code>tnt</code>:
** Added <code>block_state</code>.
*** This field allows replacement of rendered block model.
** Renamed <code>Fuse</code> to <code>fuse</code>.

'''[[Minecraft:Raw JSON text format]]'''
* Changes to chat component serialization:
** Components of type <code>nbt</code> now have <code>source</code> field with allowed values: {{cd|d=and|entity|block|storage}}.

'''[[Minecraft:Resource pack]]'''
* The [[Minecraft:pack format]] version is now <code>19</code>.
* Added block model, item model and block state definitions for <code>crafter</code>.
* Added GUI container texture and sprites for <code>crafter</code>.

'''[[Minecraft:Tag]]'''
* Added <code>firework_rocket</code> into the <code>impact_projectiles</code> entity tag.

== Experimental ==
These additions and changes only take effect when the [[Minecraft:Update 1.21]] experimental data pack is enabled.

=== Additions ===
==== Blocks ====
'''[[File:Crafter JE1.png|32px]] [[File:Crafter Triggered JE1.png|32px]] [[File:Crafter Crafting JE1.png|32px]] [[Minecraft:Crafter]]s'''
* Can be crafted with five [[Minecraft:iron ingot]]s, a [[Minecraft:crafting table]], two [[Minecraft:redstone dust]]s, and a [[Minecraft:dropper]] in the crafting table.
* Can be oriented in any direction when placed.
* A [[Minecraft:pickaxe]] can increase the speed of mining them.
* Have a user interface similar to crafting table.
** Have 3×3 interactable crafting grid.
** Their crafting grid slots are toggleable, meaning that the player can change the behavior of a slot by clicking or pressing on a slot with an empty hand.
*** A toggled slot cannot hold any items and therefore cannot have items placed into it by other blocks such as [[Minecraft:hopper]]s and [[Minecraft:dropper]]s.
*** A toggled slot can be toggled off by player, whether clicked directly or holding item(s), pressing slot keys associated with an empty or a not empty hotbar slot.
** Unlike the crafting table, the slots display a preview of the crafted item which will be crafted and ejected on the next redstone pulse, but cannot be manually taken out by the player.
** The user interface is shared between all players interacting with them, meaning that multiple players can interact with them at the same time, similar to [[Minecraft:chest]]s and hoppers.
** The user interface does not have a [[Minecraft:recipe book]] to provide help, so the player must know the recipes.
* The crafter ejects one crafted item at a time when powered by a new redstone pulse, a redstone signal that is not a continuous signal.
** Upon receiving this new signal, crafters eject the recipe result from the front face.
** All the result items are ejected together when the output result has multiple type of items.
* They can interact with hoppers and droppers, to input/output automatically.
** Hoppers can be used to both insert and pull items out of them.
** Droppers can be used to insert items into them.
** Moving items in from another block with a hopper or a dropper prioritizes filling items into slots, by following these rules:
*** If there is a toggled slot, skipped.
*** If there is not a toggled slot, crafters prioritize the first empty slot from left-to-right and top-to-bottom.
*** If there is not a toggled slot, and there are no empty slots, crafters prioritize the smallest stack of the same item. If there are multiple possible stacks, pick the first from left-to-right and top-to-bottom.
** If failed to select a slot, hoppers and droppers don't take any action.
* When read by a [[Minecraft:redstone comparator]], the redstone signal strength is 0 to 9, where each non-empty or toggled slot adds 1 strength.

=== Changes ===
==== General ====
'''[[Minecraft:Tag]]'''
* Added <code>crafter</code> into <code>mineable/pickaxe</code> and <code>needs_stone_tool</code> block tags.

== Fixes ==
{{fixes|fixedin=23w42a
|;From released versions before 1.20
|5820|The game doesn't recognise the ISO 8601 date format.
|189261|Various Realms buttons and texts are incorrectly capitalized.
|223774|Firework Rockets can't be used to break Chorus Flowers.
|225364|Chorus flowers can be destroyed by projectiles in adventure mode.
|225365|Pointed dripstone can be destroyed by tridents in adventure mode.
|232719|The scroll bar within the singleplayer menu doesn't reset its position to the top of the list when searching for worlds.
|234483|Some strange pixels can be seen on the left side of world slot frames within several Realms menus.
|237009|Incompatible worlds don't have a tooltip in the world list.
|;From 1.20
|262888|Clicking "I know what I'm doing!" on the world loading screen when loading a world in a new snapshot is way too loud.
|;From 1.20.2
|264966|<code>Signature is missing from Property textures</code> appears in the logs of some Minecraft worlds due to player heads.
|265515|The "You don't seem to have a Realm" element in the realms menu cannot be selected via the mouse cursor.
|265517|The "Buy a realm!" button is automatically selected when opening the "Add Realm" interface.
|265551|"No pending invites!" tooltip in Realms is now untranslatable.
|;previous
|265744|Kick during login causes client error.
|265745|You can’t break decorated pots with fireworks launched from crossbow.
|265751|Decorated pot subtitles are inconsistent.
|265758|Decorated pots can be destroyed by projectiles in adventure mode.
|265761|Decorated pots are missing from the creative inventory's redstone blocks tab.
|265767|Commands don't show error messages in chat.
|265773|Functions executed as advancement rewards are executed at the top level.
|265778|{{cmd|gamerule maxCommandChainLength 0}} prevents subsequent command execution in the world.
|265789|Realms popup strings consist of inconsistent concluding punctuation.
}}</onlyinclude>

== Videos ==
{{Slicedlime|d2D-CDsOQvo|nJXFKPm0b-k}}

== References ==
{{Reflist}}

== Navigation ==
{{Navbox Java Edition versions|1.2x}}

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