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{{Infobox version
|title= Minecraft 1.21 Pre-Release 1
|image= 1.21-pre1.jpg
|image2= Java Edition 1.21 Pre-Release 1.png
|edition= Java
|type= Pre-release
|date= May 29, 2024
|jsonhash=48e33f4d3741f606819287d9c5ffcc240e1eebf4 |jsonfile=1.21-pre1
|clienthash=6cb9ae7a7e5ec8143156644532d19f87b933e158
|clientmap=af36d014fca743974f186422185396baa3c82780
|serverhash=57e59ee5d8bc6ce664a7d76de45f8df9c110381f
|servermap=2b9d7fcf2e9b48fe9a00a08dfcbdadfc50b76dda
|parent= 1.21
|prevparent= 1.20.6
|prev= 24w21b
|next= 1.21 Pre-Release 2
|nextparent= 1.21.1
}}<onlyinclude>

'''1.21 Pre-Release 1''' (known as '''1.21-pre1''' in the [[Minecraft:launcher]]) is the first pre-release for [[Minecraft:Java Edition 1.21]], released on May 29, 2024,<ref name="mcnet">{{cite|url=https://www.minecraft.net/en-us/article/minecraft-1-21-pre-release-1|title=Minecraft 1.21 Pre-Release 1|date=May 29, 2024|website=Minecraft.net}}</ref> which fixes bugs and makes changes to portals.

== Additions ==
=== General ===
'''[[Minecraft:Enchantments]]'''
* <code>lookup</code>
** A "Level-Based Value" type that maps a list of values to specific levels, and applies a fallback if the level is greater than the number of values supplied.
** Fields:
*** <code>values</code>: A list of values indexed by level - 1 to apply, if present.
*** <code>fallback</code>: A fallback level-based value to apply if the level is greater than the size of values.

== Changes ==
=== Blocks ===
'''[[Minecraft:Ominous trial spawner]]'''
* Mobs removed by a trial spawner converting to ominous state now drop any items they previously picked up from the ground.

=== Items ===
'''[[Minecraft:Mace]]'''
* Attack speed has been changed to 0.6.

=== Non-mob entities ===
'''[[Minecraft:Boat]]s'''
* Are now [[Minecraft:leash]]able.

=== World generation ===
[[File:Obsidian portal blocks broken item forms.png|thumb|Blocks are now broken as if mined by the player when the obsidian platform is regenerated.]]
'''[[Minecraft:Obsidian platform]]'''
* When re-generated when a new player enters the [[Minecraft:End portal]], instead of breaking all blocks 3 blocks above it the blocks are instead broken as if mined by a player, dropping the item and (if a container) all its contents.

=== [[Minecraft:Enchantment]]s ===
'''[[Minecraft:Wind Burst]]'''
* Now bounces the player a further 7 blocks up per enchantment level, for 21 blocks at level 3.<ref>{{mcnet|minecraft-1-21-pre-release-3|Minecraft 1.21 Pre-Release 3|June 5, 2024}} "''Following changes were introduced in Pre-Release 1; The Wind Burst enchantment now bounces the player 7 blocks up per enchantment level''"</ref>

=== General ===
'''[[Minecraft:Data pack]]'''
* The [[Minecraft:pack format]] version is now <code>46</code>
* Added new configurable fields to jigsaw structures and <code>single_pool_element</code> types.

'''[[Minecraft:Debug]]'''
* The game now stores reports from failed chunks' loads and saves in the debug directory.

'''Effect conditions'''
* Unlike with loot tables, all effect conditions now need to be inline objects and cannot be references.

'''[[Minecraft:Loot tables]]'''
* <code>random_chance_with_enchanted_bonus</code>
** <code>chance</code> field has been removed.
** <code>unenchanted_chance</code>: a new field for the chance for an unenchanted item.
** <code>enchanted_chance</code>: a new field for the chance for an enchanted item; a level-based value.

'''[[Minecraft:Portal]]s'''
* [[Minecraft:Ender pearl]]s that are thrown through portals can now teleport players to a different dimension than the one they are currently in.
* It is now possible to travel with rideable entities through portals.
** When riding entities through portals, the delay before teleporting is not applied.

'''Reporting'''
* Report data generator now includes information about network packets.

'''Server links'''
* There are some generic-use link names, like "Support" or "Website", without any special functionality.{{Info needed|What does this mean?}}

'''Structures'''
* Added <code>liquid_settings</code> field to structures of type <code>minecraft:jigsaw</code>.
* Possible values:
** <code>apply_waterlogging</code>: If any waterloggable block overlaps with existing water, it will become waterlogged.
** <code>ignore_waterlogging</code>: Will not waterlog any waterloggable blocks that overlap existing water.
*** Default value is <code>apply_waterlogging</code>.
* Added optional field <code>override_liquid_settings</code> to <code>single_pool_element</code> element type.
** Same possible values as the <code>liquid_settings</code> in jigsaw structures.
** Overrides the inherited liquid settings from the parent jigsaw structure while generating this pool element.

'''[[Minecraft:Tag]]s'''
* The <code>fire_aspect_lightable</code> block tag was removed.

== Removals ==
=== General ===
'''[[Minecraft:Enchantments]]'''
* Removed the functionality of [[Minecraft:Fire Aspect]] being able to light blocks on fire.
** Mojang has stated that this feature has been temporarily removed for refinement, and will be reintroduced in a later release.<ref name="mcnet"/>

'''[[Minecraft:Gamerules]]'''
* Removed the <code>entitiesWithPassengersCanUsePortals</code> [[Minecraft:gamerule]] that was introduced in [[Minecraft:24w21a]].
** Entities with passengers being able to use portals is now the default behavior.

'''[[Minecraft:Tag]]s'''
* The <code>fire_aspect_lightable</code> block tag was removed.

== Fixes ==
{{fixes|fixedin=1.21 Pre-Release 1
|;old
|902|The End obsidian platform resets every time entities go through the End portal, which can cause blocks to be deleted.
|8983|Primed TNT cannot travel through nether portals.
|50612|Command blocks do not update when you place them near any source of power.
|97087|Attributes won't work in main hand if they were in offhand.
|114566|Can't teleport back to the central island with End gateway portal on outer End islands.
|148741|Selection boxes in some screens are misaligned in comparison with their text.
|160140|Shulker boxes on the obsidian platform are destroyed and do not drop when a player enters the End.
|169698|Blocks within igloo basements can generate waterlogged when generating in close proximity to water.
|170907|Network position deltas are processed relative to a wrong point.
|172031|Throwing an ender pearl into a nether or End portal often has no effect.
|191591|Saddles lose their NBT data when equipped on horses, zombie horses, skeleton horses, mules or donkeys via right-clicking.
|225870|Breeding an axolotl in Creative replaces the bucket of tropical fish.
|265583|Incorrect pluralization for skin customization strings for pants.
|265818|The "{{cd|gamerule.doVinesSpread.description}}" string consists of grammatically incorrect word usage.
|266140|The "Open link" button within the Realms menu is improperly capitalized.
|266471|Trial chambers can intersect aquifers, causing some blocks inside the structure to be waterlogged.
|267050|Chat disabled strings are missing verbs.
|267071|The word "packs" within the "{{cd|download.pack.failed}}" string is always pluralized.
|267474|Strings referencing the player's off hand are inconsistently spelled.
|267954|World upgrade and downgrade Realms strings are improperly capitalized.
|268023|The "{{cd|selectWorld.experimental.details.title}}" string displayed within the experimental features details menu is improperly capitalized.
|268185|Copper grates in trial chambers are waterlogged.
|269439|Some diacritics intersect the language box in the languages menu.
|269617|When ender pearls teleport non-player entities, no teleportation sound is played upon impact.
|269921|Wind charges can be thrown though corners.
|270181|Wind charges go through an entity if it is close to a player.
|270572|Programmer Art resource pack duplicates some GUI texture files.
|270649|The width of challenge advancements header is calculated in relation to the slash formatting of progress counter, causing overlap in some languages.
|270795|Mobs despawned by ominous trial spawners can delete picked up items.
|270821|Regular trial spawners spawn the first mob with ominous trial equipment if they were last active as ominous.
|270981|View Bobbing toggle is not available in Accessibility Settings.
|271293|Wind charge, fireball and shulker bullet makes a "Burning" sound as it passes through the lava.
|271446|Mace attack speed was lowered to a point where all Wind Burst smash attacks are performed on uncharged attacks.
|271897|End portal makes items disappear.
|272014|Ender Dragon death animation is broken since 20w22a (and broken again in 20w45a).
|272073|Item displays with billboard and rotation values create major visual bug.
|272079|Medium/small slimes and magma cube's attack reach is too short.
|272198|Shulkers' models sometimes appear offset upon End city generation.
|272253|The strength of the Riptide enchantment is increased when holding tridents enchanted with Riptide in both hands.
|272267|"Changes the blurriness of menu background" lacks punctuation.
|272279|Resource packs containing TrueType fonts fail to load on x64 macOS systems.
|272308|Axolots can be attached to new leads when being already leashed.
|272445|Command blocks made from {{key|Control}} + Pick Block do not activate on first try.
|272469|When the wind charge, fireball or shulker bullet is in the lava, it will continue to make a high-loudness noise.
|272515|Component-modified saddles get their components wiped when dispensed onto a horse, mule, or camel.
|;dev
|271870|{{cd|random_chance_with_looting}} function base value is for enchantment level 1.
|271929|Applying multiple layers of "{{cd|using_converts_to}}" will produce ghost items.
|272038|The error "{{cd|Can't access registry ResourceKey[minecraft:root / minecraft:game_event]}}" is sometimes in the log file.
|272053|The "{{cd|armor_effectiveness}}" effect does not work with projectiles or indirect damage.
|272258|{{cd|block.portal.travel}} sound now plays when teleporting to a different dimension using commands.
|272264|Narrator button in Accessibility Settings doesn't update upon pressing {{key|Control}} + {{key|B}}.
|272311|The enchantment glint sometimes doesn't render in interfaces and first person.
|272313|The game crashes when attempting to open the Realms menu.
|272315|Serial comma is missing from the {{cd|entitiesWithPassengersCanUsePortals}} game rule description.
|272322|When the player is riding an entity through portals, the player and the entity may teleport to the wrong place.
|272328|{{cd|entitiesWithPassengersCanUsePortals}} game rule description is missing the proper term capitalization.
|272329|Riding an entity into portals may cause the game to softlock.
|272355|Ellipsis text is stringified within NBT text formatter list truncation.
|272424|Chunks occasionally have large dark areas in the sky.
|272430|Breaking a carrot/warped fungus on a stick gives a damaged fishing rod.
|;previous
|272339|Holding crossbows in both hands stacks Quick Charge.
|272342|Typo in mining fatigue attribute ID "{{cd|minecraft:effect.minining_fatigue}}".
|272343|Ender pearls don't work when riding an entity.
|272344|When teleported by an ender pearl, the "portal noise fades" sound is played.
|272347|Upgrading from before 24w21a doesn't update structures saved by structure blocks.
|272361|Minecarts and passengers offset from block when riding through portals.
|272364|Players spawn one block above the obsidian platform when entering an End portal.
|272365|Inventory images of all banners are completely white.
|272369|The player can respawn in a solid block with default spawnpoint.
|272374|24w21b will not upgrade {{cd|attribute_modifiers}} from previous versions.
|272399|Primed TNT entities can't go through an End portal anymore.
|272400|Shield in inventory with banner shows as white.
|272403|Portal linking chunk loading changes.
|272406|Crash when zombie tries to spawn second reinforcement.
|272408|{{cd|set_attributes}} item modifier can add the same attribute modifier twice.
|272427|Flame, Power, Punch, and Piercing enchantments no longer work on the last use of the item.
|272438|End crystal entities can't go through an End portal anymore.
|272442|Comparator output of jukebox no longer persists on music disc finish.
|272490|{{cd|@n}} can select dying entities, unlike {{cd|@e}}.
}}</onlyinclude>

== Videos ==
{{slicedlime|N2Vs_bC95c0|S0BaPsbgsps}}

== References ==
{{Reflist}}

== Navigation ==
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Minecraft:Java Edition 1.21 Pre-Release 1 - Revision history

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