Minecraft 1.21 Snapshot 24w21b Server Hosting

Minecraft 1.21 Snapshot 24w21b Server Hosting

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A new Minecraft Java 1.21 snapshot is here!

This week we’re bringing a Snapshot you can vibe out to! This time around we’re bringing data-driven jukeboxes, a new gamerule, and a bunch of fixes.

Happy vibing!


  • MC-272321¬†– Crash after upgrading snapshot world to 24w21a


  • It seems we cooked a bit too hard with the new Piston sounds last week, which is why we’re reverting back to the old sounds again
  • Lowered volume of original sounds to address initial feedback of Pistons being too loud
  • Pause menu now can include a list of links provided by server
  • Improvements to the disconnection screen
  • Any member of a Realm can now upgrade a world
  • In the Realms main screen, all online players of a Realm are displayed
    • When hovered, a tooltip is shown with each player’s head and name


  • Added sound effect to help players understand they’ve already looted a vault


  • Trial Chambers are less likely to generate in the Deep Dark


  • Animals now panic based on the damage caused by predefined Damage Source Types
  • The panic lasts for 2 seconds after the damage is dealt. The following damage type tags are used by vanilla animals:
    • panic_environmental_causes: Used by Wolves, Polar Bears (adults) and Pandas
    • panic_causes: Used by all other animals and baby Polar Bears


  • Servers can now provide a list of links to clients
  • If client has received any links, a new button called “Server Links…” will show up in pause game screen
    • To make space for that button, “Report Bugs” and “Give Feedback” buttons might be moved into a sub-screen if necessary


  • In some cases client will now store detailed information about disconnection (similar to crash reports)
  • When that happens, new “Open Disconnection Report Directory” button will be added to the disconnection screen
  • When server provides link for bug reporting, it will be also be added as a button to the disconnection screen


  • Resource Pack version is now 34
  • Data Pack version is now 45
  • Server can now provide list of links to client
  • Servers can add custom details to crash and disconnection reports


  • Added new¬†entitiesWithPassengersCanUsePortals¬†gamerule
    • When¬†true, entities with passengers can use Nether Portals, End Portals and End Gateways
    • Defaults to¬†false


  • New clientbound packet¬†server_links¬†is available in¬†configuration¬†and¬†game¬†protocols
  • On receival, client will make links available from pause menu
  • Link labels can be built-in or custom (i.e. any text)
  • Some built-ins also have special fuctionality:
    • report_bug:
      • link will be displayed on disconnection screen, if disconnection was caused by packet handling error
      • link will be included as a comment in disconnection report
  • Added¬†bug-report-link¬†to¬†server.properties¬†to allow vanilla server to configure¬†report_bug¬†links
    • If this field is non-empty, server will send that link to clients
    • This field should contain well-formed URL


  • New clientbound packet¬†custom_report_details¬†is available in¬†configuration¬†and¬†game¬†protocols
  • This packet contains a list of key-value text entries
  • If received, contents of this packet will be added in a separate section to any crash or disconnection report generated during connection to this server


  • Jukebox songs are now data-driven
  • Added new command syntax


  • Added a jukebox song registry which is loaded from data packs
  • Path to jukebox song definition is¬†data/<namespace>/jukebox_song/<id>.json
  • Fields in definition:
    • sound_event¬†– sound event that is streamed when played by a Jukebox
    • description¬†– the name of the song that will be displayed in the hover tooltip represented as a Text Component
    • length_in_seconds¬†– length of the song in seconds as a positive float
    • comparator_output¬†– the redstone signal output by a comparator when played in a Jukebox, between 0 and 15
  • Added¬†minecraft:jukebox_playable¬†item stack component


  • If set, the item can be inserted into Jukeboxes to play a song
  • Format: object with fields
    • song: jukebox song id
      • The song that will be played by the Jukebox when this item stack is inserted
    • show_in_tooltip: boolean (default: true)
      • If false, the name of the song will not be shown in the tooltip
      • This was formerly controlled by the¬†hide_additional_tooltip¬†component on Music Discs
    • e.g.¬†jukebox_playable={song:’minecraft:precipice’},¬†jukebox_playable={song:’minecraft:precipice’, show_in_tooltip:false}


  • Attribute modifiers no longer have a UUID and name combination
  • Instead, attribute modifiers are now uniquely identified by a namespaced ID, similar to other resources
  • The ID of a modifier uniquely identifies it in the set of modifiers for a single attribute
    • Using the same ID for different modifiers is allowed as long as the modifiers are for different attributes
  • Existing built-in modifiers will be upgraded to new IDs
  • Existing custom modifiers will be upgraded to the GUID as an ID in the¬†minecraft¬†namespace


  • The¬†uuid¬†and¬†name¬†arguments have been replaced with a singular¬†id¬†argument


  • The¬†uuid¬†and¬†name¬†fields have been removed.
  • Attribute Modifiers now have an¬†id¬†(namespaced ID) field
    • This is a unique identifier per attribute for the modifier


  • Attributes are now stored as¬†attributes
  • Attribute format:
    • id, renamed from¬†Name
    • base, renamed from¬†Base
    • modifiers, renamed from¬†Modifiers
      • Now stores modifiers in the same format as modifiers in¬†attribute_modifiers¬†item stack components:
        • id, replaces¬†UUID¬†and¬†Name
        • amount, renamed from¬†Amount
        • operation, renamed from¬†Operation, now a named constant instead of an int:
          • add_value¬†– previously¬†0
          • add_multiplied_base¬†– previously¬†1
          • add_multiplied_total¬†– previously¬†2




  • name¬†&¬†uuid¬†have been removed, replaced by¬†id
  • id: The namespaced ID of the Attribute Modifier to add
    • This will be postfixed with the slot name when the enchanted item is equipped in a slot
    • Must be unique to avoid different Enchantments (or other systems) interfering with each others



The damage is not applied to items held by players in creative mode.

Hit Block Parameters
  • Entities:¬†this
  • Enchantment Level
  • Origin
  • Block State


  • minecraft:hit_block:
    • Condition Context: changed to take a Hit Block Parameter –¬†this¬†is the entity hitting the Block



  • Some registry types that used legacy datapack directory names (based on plural name of element) have been renamed to match registry name
  • Affected directories:
    • structures¬†->¬†structure
    • advancements¬†->¬†advancement
    • recipes¬†->¬†recipe
    • loot_tables¬†->¬†loot_table
    • predicates¬†->¬†predicate
    • item_modifiers¬†->¬†item_modifier
    • functions¬†->¬†function
    • tags/functions¬†->¬†tags/function


  • Removed¬†music_discs¬†item tag


  • air: All blocks that resemble air


  • Removed¬†breeze_immune_to¬†damage type tag
  • Added¬†panic_environmental_causes: Damage types that cause panic in aggressive animals that can panic, i.e. mobs that retaliate when attacked
  • Added¬†panic_causes: Damage types that cause panic in passive animals, i.e. mobs that run away when attacked



New item sub-predicate available as jukebox_playable.

  • Matcher for¬†jukebox_playable¬†component (like Music Discs)
  • Fields:
    • song¬†– optional id, list of ids or tag for jukebox song to be matched


  • The¬†gamemode¬†field has been changed to accept a list of gamemodes


  • Added¬†@n¬†entity selector, selecting the nearest entity
    • This functions as¬†@e[sort=nearest,limit=1]
    • Additional requirements may still be provided; for example:¬†@n[type=pig]¬†will select the closest Pig


  • Added the¬†block.vault.reject_rewarded_player¬†sound event
  • Changes to Shaders


  • The¬†blend¬†block in core shader definitions has been removed, as it was not used
  • The¬†position_color_tex¬†shader has been removed, replaced with the pre-existing¬†position_tex_color
  • The¬†glint_direct¬†shader has been removed, replaced with the pre-existing¬†glint¬†shader
  • The¬†armor_glint¬†shader has been removed, as it was unused


  • MC-67¬†– Entities with passengers cannot travel through portals
  • MC-31819¬†– Hunger saturation depletes on peaceful difficulty
  • MC-116279¬†– Non-player entities going through Nether portal do not generate portal in Nether if none exists
  • MC-151648¬†– Non-player entities cannot travel through unlinked nether portals
  • MC-170103¬†– Untamed wolves only beg for food while being angry and jumping
  • MC-260346¬†– Custom music discs cut off when vanilla disc would normally end
  • MC-266290¬†– Double doors do not automatically form between waxed and unwaxed copper doors, even of the same variant
  • MC-266586¬†– Trial chambers can spawn directly inside the deep dark biome
  • MC-266626¬†– Breeze doesn’t stop attacking the player when it enters on the same team
  • MC-267967¬†– Breezes ignore the deflects_projectiles entity type tag
  • MC-268438¬†– Baby armadillos can still eat while rolled up
  • MC-269034¬†– Wolves no longer teleport while trying to pathfind out of Lava
  • MC-269351¬†– The Bolt Armor Trim cannot be duplicated with Waxed Copper Block
  • MC-269370¬†– Sharp lag spike caused by incorrect upper limit on particles created by mace smash attack
  • MC-269460¬†– Thorns enchantment doesn’t work when entities are hit by wind charges
  • MC-269964¬†– Ominous item spawners are missing an NBT load for spawn_item_after_ticks
  • MC-269988¬†– New potion effects don’t apply their respective behaviors when creeper explodes
  • MC-270024¬†– When drinking ominous bottles, bad omen of higher levels can be overriden by lower amplifiers
  • MC-270377¬†– Wind charges can be hit and redirected the moment they are thrown
  • MC-270573¬†– Mounted entities are immune to wind charge damage
  • MC-270808¬†– Any item in the armor.body slot protects wolves from taking damage
  • MC-271458¬†– Channeling tridents no longer summon lightning bolt every time hitting lightning rod under thunderstorm
  • MC-271573¬†– Attribute Enchantments Don’t Behave Properly on Armor
  • MC-271634¬†– Custom enchantments don’t appear in the creative menu
  • MC-271718¬†– Crash when randomized_int_state_provider is applied to blocks lacking the property
  • MC-271753¬†– Crash due to overflow inside cost calculation in by_cost_with_difficulty
  • MC-271856¬†– Crossbows enchanted with Quick Charge do not benefit from its effects when used in the offhand
  • MC-271868¬†– Frost walker replaces flowing water now
  • MC-271901¬†– Entity effect “play_sound” Field “pitch” value upper limit is 1.0 instead of 2.0
  • MC-271911¬†– Frost walker no longer works with void or cave air
  • MC-271914¬†– Soul speed enchantment doesn’t emit particles when the entity is controlled by a player
  • MC-272039¬†– Soul Speed uses durability in creative mode
  • MC-272042¬†– If players have max health over 20 and die, when they respawn they will have 20 health instead of their max health
  • MC-272043¬†– The game crashes when entities die while having the oozing effect
  • MC-272075¬†– Attempting to step up while controlling entity and moving fast often glitches
  • MC-272084¬†– Creepers with potion effects no longer create area effect clouds upon exploding
  • MC-272182¬†– Knowledge Books no longer function properly with a stack size of 1 in survival/adventure mode

Follow along with all the previous updates for the Minecraft 1.21 snapshot

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Memory Requirements & Player Slots

  • Memory Guideline
    To avoid lag or memory errors, order a minimum of 3GB of memory. If you are playing with friends or planning on hosting a public server consider ordering 4GB or more. You won't know your exact requirements until you start building and getting more players on. Don't worry you can quickly upgrade your memory as your server grows. Follow this guide if you need to upgrade.

  • Recommended Max Players is our best guess on how many slots gives good performance per GigaByte of memory. It relates to how many players can join before running into lag or out-of-memory errors. Newer servers with lots of mods/plugins will have less players per GB, you won't know exactly how many players until your server gets busy. You have Unlimited Slots, set this in the control panel, use your slots wisely. It's a guideline not set in bedrock!
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