It is now time for the first Pre-release of Minecraft 1.20.5, featuring some tweaks to Trial Chambers and Ominous Trials, as well as new advancements, a big set of technical tweaks and changes, and lots of bug fixes.

From now on, you should mostly see bugs being fixed. In addition to that, pre-releases don't follow the regular snapshot cadence of releasing on Wednesdays, so keep an eye out for the next pre-release.

Experimental Features

Trial Chambers

• More consistently buried by terrain when found underground
• Remade 'Chamber 6' with variations, and renamed it to 'Assembly'
• Added a new trap dispenser style to chambers
• Fixed various broken jigsaw connections in the corridors
• Chamber Eruption:
  • Stopped Tuff Bricks from spawning in the air
  • Added more lights to quadrants

Ominous Trials

• Mobs that can wear equipment will now often spawn with enchanted weapons and armor
  • Armor enchantments include Protection IV, Projectile Protection IV and Fire Protection IV
  • Weapon enchantments include Sharpness I, Knockback I, Power I and Punch I
• Mobs that wear equipment no longer have a chance to drop their equipment on death
• Players are now chosen 50% of the time when an Ominous Trial Spawner chooses which entity to drop projectiles on top of
  • Projectiles now spawn more accurately above chosen entities

Weaving

• Now more consistently spawns 2-3 cobwebs on death
• Players are now affected by the movement buff through Cobwebs
  • Move through Cobweb with 50% of their normal speed instead of 25%

Infested

• Now has a 10% chance to spawn 1-2 Silverfish instead of 5%
• Silverfish will now spawn at the center of the entity's bounding box and fling out in the direction the entity is facing

Oozing

• Will only spawn slimes in a given 5x5x5 area up to the max entity cramming count

Advancements

• Added Revaulting - Unlock an Ominous Vault with an Ominous Trial Key

New Features in 1.20.5-pre1

Advancements

• Added the following advancements:
  • Isn't it Scute? - Get Armadillo Scutes from an Armadillo using a Brush
  • Snip it! - Remove Wolf Armor from a Wolf using Shears
  • Good as New - Repair a damaged Wolf Armor using Armadillo Scutes
  • The Whole Pack - Tame one of each Wolf variant

Changes in 1.20.5-pre1

• Added support for Viossa language

Technical Changes

• The Data Pack version is now 39

Data Pack Version 39

• Added new item sub-predicates and loot functions
• Added new terrain adaptation type for structures: encapsulate
  • Density will be added all around every piece of a structure
  • Ideal for structures that need to be entirely covered underground
• The page limit in Written Books has been removed
• The combination of max_stack_size and max_damage components is no longer allowed in commands and data pack definitions
• Added a new option body in entity equipment sub-predicate to match the item in the body armor slot of an entity
• The saturation_modifier field on the food component has been replaced with saturation
  • saturation is the exact value added to the player's saturation level
  • In respect to the former saturation_modifier, this is defined by saturation = nutrition * saturation_modifier * 2
• Particle representation in commands and area effect clouds has been changed
• Changed optional equipment_loot_table field in the SpawnPotentials of Monster Spawners and spawn_potentials of Trial Spawner configs
  • Now named equipment instead of equipment_loot_table
  • Format: object with fields
    • loot_table - A loot table used to generate the equipment
    • slot_drop_chances - An optional map of equipment slot to specified drop chance
      • Can also be a single value instead of a list to apply to all slots: e.g. slot_drop_chances: 0.0f will apply a chance of 0% to all slots
  • e.g. equipment: {loot_table: "minecraft:equipment/trial_chamber", slot_drop_chances: {"head": 0.0f, "chest": 0.25f, "legs": 1.0f, "feet": 0.25f}}
  • If present, rolled items from the specified loot table will be equipped to the mob that spawns
• Removed Item tag minecraft:tools (overlapping with minecraft:breaks_decorated_pots)
• Added Entity Type tag minecraft:punchable_projectiles for projectiles which should be able to be punched and deflected toward the direction the player is looking
• Added Enchantment tag minecraft:tooltip_order controlling which order Enchantments are listed in tooltips

Modified loot functions

set_contents

• Unused field type has been removed
• Added new mandatory field component:
  • Describes target component to be filled with items
  • Existing contents will be replaced
  • Allowed values: container, bundle_contents, charged_projectiles
  • bundle_contents and charged_projectiles will ignore empty stacks

set_custom_data

Field tag now accepts both SNBT data written as a string (existing format) and unflattened tags

New Loot Functions

modify_contents

• Apply modifier function to every item inside a component
• If component does not exist, it will not be added
• Fields:
  • conditions- list of conditions to filter this function
  • component - target component
    • Allowed values: container, bundle_contents, charged_projectiles
  • modifier - function or list of functions to be applied to every item inside container

set_item

• Replaces item type of item stack without changing count and components
• Fields:
  • conditions - list of conditions to filter this function
  • item - new item type

filtered

• Applies sub-function only to items that match item predicate
• Fields:
  • conditions - list of conditions to filter this function
  • item_filter - item predicate used to match items
  • modifier - functions to apply to matching items

set_custom_model_data

• Sets custom_model_data component
• Fields:
  • conditions - list of conditions to filter this function
  • value - integer number provider

New Item Sub-predicates

General rules of component predicates:

• Unless otherwise specified, a field in predicate with the same name as a field in component that matches (i.e. has the same name as predicate) will match that field value
• Those fields will usually have the same type as in the components, but will be optional.
• Exceptions:
  • List fields will be replaced with collection matchers (see below)
  • Integer and float fields will be replaced with ranges
  • Registry ids will be replaced with a type that accepts id, list of ids or a tag

Collection matcher

Collection matcher is a shared part of predicate used for matching collections. Every instance of this matcher will have same fields with same functionality, with only difference being type of matched element Fields:

• size - integer range to match against collection size
• contains - a list of element predicates
  • All conditions must match for predicate to pass
  • Not all elements in tested container have to be matched
  • Elements can be in any order
  • Single element can match multiple predicates
  • Examples (when matching item stacks):
    • {contents:[{item:diamond}]} - will match when there is at least one diamond item
    • {contents:[{item:diamond}, {item:dirt}]} - will match when there is at least one diamond item and at least one dirt item
• count - a list of matchers on element counts
  • Entry fields:
    • test - element matcher
    • count - optional integer range to check against number of elements passing test
  • Examples (when matching item stacks):
    • {count:[{count:3,test:{items:diamond}}]}} will match only when there are exactly 3 stacks of diamonds (no matter the stack size)

container

• Matcher for container component (like shulker box)
• Fields:
  • items - optional collection matcher
    • Note: empty items are ignored. That means container~{items:{size:3}} will only pass if there are exactly 3 non-empty stacks in container

bundle_contents

• Matcher for bundle_contents component
• Fields:
  • items - optional collection matcher

firework_explosion

• Matcher for firework_explosion component
• Fields
  • shape - optional matcher for shape, same values as shape field in minecraft:firework_explosion component
  • has_trail - optional boolean
  • has_twinkle - optional boolean

fireworks

• Matcher for fireworks component
• Fields:
  • explosions - optional collection matcher for firework_explosion predicates
  • flight_duration - optional integer range check for flight duration
• Example: minecraft:fireworks~{explosions:{contains:[{shape:small_ball}]}}] - matches if firework has at least one explosion with small_ball shape

writable_book_content

• Matcher for writable_book_content component
• Fields
  • pages - optional collection matcher for strings (matching only unfiltered contents of page)

fireworks

• Matcher for written_book_content component
• Fields
  • pages - optional collection matcher for chat components (matching only unfiltered contents of page)
  • author - optional string value
  • title - optional string value (matching only value)
  • generation - optional integer range check for generation
  • resolved - optional boolean

attribute_modifiers

• Matcher for attribute_modifiers component
• Fields:
  • modifiers - optional collection matcher for following entries with following fields:
    • attribute - optional id, list of ids or tag for attribute to be matched
    • id - optional UUID
    • name - optional string
    • amount - optional double range check
    • operation - optional operation type (same values as operation field from attribute_modifiers component)
    • slot - optional applicable slot type (same values as slot field from attribute_modifiers component)

trim

• Matcher for trim component
• Fields:
  • material - optional id, list of ids or tag for material to be matched
  • pattern - optional id, list of ids or tag for pattern to be matched

Particle representation

• Particle options in commands and in fields like Particles in Area Effect clouds now use the same representation as worldgen files (like existing biomes' ambient particle settings)
• For example, command /particle minecraft:dust 1.0 0.0 0.0 2.0 ... becomes /particle minecraft:dust{color:[1.0, 0.0, 0.0], scale:2.0} ...
• The syntax for particles without extra options (like minecraft:villager) remains unchanged
• Changes to block particles (minecraft:block, minecraft:block_marker, minecraft:falling_dust, minecraft:dust_pillar) options:
  • Field value has been renamed to block_state
  • Field block_state now also accepts plain block name to represent default block state
  • Example transformations:
    • minecraft:block minecraft:redstone_lamp[lit=true] -> minecraft:block{block_state: {Name: "minecraft:redstone_lamp", Properties: {lit: "true"}}}
    • minecraft:block minecraft:diamond_block -> minecraft:block{block_state: "minecraft:diamond_block"}
• Changes to minecraft:item options:
  • Field value has been renamed to item
  • Field item now also accepts plain item name to represent item stack with default components
  • count field is now ignored
  • Example transformations:
    • minecraft:item minecraft:dirt -> minecraft:item{item: {id: "minecraft:dirt"}}
    • minecraft:item minecraft:dirt -> minecraft:item{item: "minecraft:dirt"}
• Changes to dust_color_transition options:
  • Field fromColor has been renamed to from_color
  • Field toColor has been renamed to to_color
  • Example transformation: dust_color_transition 1.0 0.0 0.0 0.5 0.0 1.0 0.5 -> dust_color_transition{from_color: [1.0f, 0.0f, 0.0f], scale: 0.5f, to_color: [0.0f, 1.0f, 0.5f]}
• Changes to entity_effect options:
  • Field value has been renamed to color
  • Field color now also accepts list of floats representing RGBA color

Fixed bugs in 1.20.5 Pre-Release 1

• MC-165435 Can't trigger flying mode in creative while standing in the middle of 2×2 magma block bubble column
• MC-188497 AngerTime and AngryAt cannot be set on summon
• MC-207353 Ghast fireballs and wind charges can't be redirected in melee if the attack does 0 damage
• MC-263315 Attack Target of hoglins/zoglins can't be detected by /execute on target
• MC-264456 Entity targeted by frogs and axolotls can't be detected by /execute on target
• MC-265390 Forceload Command provides wrong output
• MC-267934 Sending ClientboundTransferPacket followed by disconnect just kicks the player
• MC-268000 The client crashes when using /give to give players a skull
• MC-268346 Jump can be used with generic.jump_strength set to 0 resulting in a speed boost
• MC-268947 Flying cannot be initiated reliably when the minecraft:generic.gravity attribute is increased
• MC-269191 Old villagers can't trade
• MC-269192 Breeze is not affected by the 'execute on target' command
• MC-269266 Area effect cloud particles from creeper explosions are incorrectly tinted
• MC-269320 Books with more than 100 pages get cut off when upgraded
• MC-269357 Flow and guster banner pattern descriptions display as raw translation strings
• MC-269366 Mace doesn't break Decorated Pots unlike other tools
• MC-269496 You don't get any damage if you fight against the breeze in a minecart or in a boat
• MC-269501 The text above the hotbar has no background, even when the "Text Background" setting is "Everywhere" in spectator mode
• MC-269508 Player keeps vertical momentum when jumping when landing on the ground from sonic boom
• MC-269609 Wind charges can harm the ender dragon while it perches atop the end portal, unlike arrows and tridents.
• MC-269610 Wind charges have the capability to harm the wither when it has reached half health or less
• MC-269680 Game crashes when trying to save after modifying item stack to have a max_stack_size below its current stack size
• MC-269707 Brewing stand slots have artificial maximum stack size of 64
• MC-269765 Mace damage does not reset after a hit while still falling
• MC-269933 limit_count item modifier can create overstacked items
• MC-269947 Clicking spam with Mace causes very high damage
• MC-269948 The subtitle for the "minecraft:event.mob_effect.raid_omen" sound event displays as a raw translation string
• MC-269949 New "Raid Omen" effect texture is using Programmer Art Evoker as base
• MC-269954 Striking non-living entities with a mace enchanted with Wind Burst propels the player upward, even when they are flying
• MC-269955 When flying in creative mode, hitting ender dragons with a mace enchanted with Wind Burst pushes the player upward, unlike when attacking other mobs
• MC-269959 "Not a list" printed to console when loading into a world
• MC-269961 Non-player entities with the Weaving effect can't walk through Cobweb at normal speeds
• MC-269963 Bad Omen is not removed when experimental features are disabled
• MC-269974 Mobs with the weaving effect, when dying, are unable to replace replaceable blocks with cobwebs
• MC-269976 Wind Burst book available from villager trading
• MC-269977 Wind Burst enchantment is obtainable in Enchanting Table
• MC-269980 Wind Burst enchantment triggers from normal attacks rather than smash attacks
• MC-269993 Hitting wind charges using mace with Wind Burst creates very high upwards momentum
• MC-269999 Potions of Infestation, Oozing and Weaving can be obtained without experimental features enabled
• MC-270001 The particle 'minecraft:item minecraft:air' crashes the client
• MC-270004 Giving yourself an item with a Wind Burst enchantment level higher than 3, then hitting certain entities crashes the game
• MC-270005 Mace smash attack can be done multiple times from a single fall
• MC-270009 Entities with the infested effect can spawn silverfish without actually being hurt
• MC-270048 Vault textures are inconsistent
• MC-270060 The glowing parts of trial spawner textures are inconsistent
• MC-270094 Fletcher sells new tipped arrows without experimental features enabled
• MC-270099 Killing a mob with Weaving effect places cobwebs even if mobGriefing is disabled
• MC-270119 The contents slot for the /item command does not function with shot arrows, tridents, and fireballs
• MC-270125 Wind Burst can be obtained from chest and fishing loot
• MC-270158 Wind Burst activates while mace is on cooldown
• MC-270161 Wind burst enchantment is significantly stronger on vehicle entities
• MC-270201 Fishing rod line does not account for the scale attribute in third-person
• MC-270236 area_effect_cloud and lingering potions causing potion_contents.custom_color to be slightly transparent
• MC-270412 Wind charge item crash on non-experimental worlds.
• MC-270475 Container component slot -1 crash