Java Edition 23w18a

23w18a is the sixth and final snapshot for Java Edition 1.20, released on May 3, 2023.^[1]

Advancements

• The Power of Books
  • Read the power signal of a Chiseled Bookshelf using a Comparator.

Smithing table

• No longer requires a smithing template to be in the template slot before placing an item into the other slots.

Slimes and magma cubes

• Are now affected by the Jump Boost effect.

Advancements

• All fields in placed_block, item_used_on_block, and allay_drop_item_on_block advancement triggers have been collapsed to a single location field.
  • New location is similar to the player field - it's a list of loot conditions/predicates.
  • All conditions in this list must match for a trigger to run.
• Conditions are evaluated in a new loot context called advancement_location. It has access to:
  • Player as this entity.
  • Position of the placed/interacted block.
  • Block state of the placed/interacted block.
  • Held/used item as "tool".
• Migration guide:
  • Contents of old location field should be migrated to a location_check condition.
  • Contents of item field should be migrated to a match_tool condition.
  • Contents of block and state fields should be migrated to a block_state_property condition.
• Advancement fields now have a new boolean field called sends_telemetry_event.

Data packs

• Version is now 15, accounting for predicate/loot table and advancement changes.

Creative inventory

• Jukebox has been added to the "Redstone Blocks" tab.

Predicates

• Condition alternative has been renamed to any_of.
• Added new condition all_of that passes only when all sub-conditions pass.
  • It has the same syntax as any_of.

Sounds

• Walking on a block now always plays a step sound.
  • It was previously not the case if the player was walking along the edge of a block with air or fluid beside it.
• Walking on the ocean floor produces a step sound for the block the player is walking on, but at a lower volume and pitch.

Telemetry

• Added new property: launcher_name.
  • A new global property sent with every event.
  • This is set based on the minecraft.launcher.brand system property.
  • This helps developers troubleshoot game launch related bugs more effectively, as they are able to see whether the issue originated in the Minecraft launcher or a third-party program.
• Added new property realms_map_content to event world_loaded.
  • When loading into a Realms Map Content world (Minigame), the world_loaded event receives the name of that map.
  • This is to help developers understand how Java Realms users interact with Java Realms adventure or minimap content.
• Added new optional event advancement_made.
  • This event is triggered when a player completes an advancement.
  • This allows developers to see the advancement ID and the time when the advancement was completed, and helps them as a studio understand player progress and limits, which informs their game design.
• Added new optional event game_load_times.
  • An event that is triggered when the game client is loaded, and includes the time it took for the client to load.
  • This is so that developers can work on improving and reducing the time it takes to load the game client.

28 issues fixed

From released versions before 1.20

• MC-1133 – Whether or not a player experiences some effect is calculated based on the block under the center of the player.
• MC-2604 – Walking on non-solid blocks with no collision plays their respective walking sounds.
• MC-48923 – Slime/magma cubes not affected by jump boost potion effect.
• MC-75721 – Arrow buttons within the book GUI are rendered above tooltips.
• MC-130089 – Turtle eggs break weird at block edges.
• MC-158154 – Players can bounce on beds even when not directly touching it.
• MC-199952 – Skylight does not propagate across certain chunk borders upon world generation.
• MC-203317 – There is a missing torch in one of the Stronghold rooms leaving a Light source.
• MC-207290 – Sculk sensors don't detect vibrations while walking on the edge of a block.
• MC-212583 – Sculk sensors are not activated upon walking inside of scaffolding that has air below it.
• MC-217447 – "Walking" on nether wart produces stone footstep sounds instead of nether wart sounds.
• MC-240098 – Minecraft can't be correctly profiled to Windows 11 version.
• MC-242105 – When landing on some non-full blocks while touching a thin block, impact particles use the thin block's texture.
• MC-244307 – Dark Chunks when exploring since 1.18.
• MC-252389 – When landing (or jumping) on wool with your hitbox over the edge, it produces a vibration.
• MC-257269 – Sculk sensor detects player walking between carpet and wool.
• MC-259978 – Minecraft telemetry data detected Windows 11 as Windows 10.
• MC-260279 – Jukebox is not in the Redstone Blocks tab in the creative inventory.
• MC-261417 – The hitboxes of sniffers are not adjusted when they lay down.
• MC-262067 – The type of sniffer digging particles that are produced is determined by the block that sniffers are located on instead of the block that sniffers are digging.
• MC-262069 – Sniffers continue digging after their target block is destroyed.

From the 1.20 development versions

• MC-261952 – Clocks flicker rapidly when enchanted and in an unnatural dimension.
• MC-262003 – Bundle tooltip does not show its interface.
• MC-262104 – Rendering of FPS graph seems to be performing worse than before.

From the previous development version

• MC-262123 – Advancement titles of new advancements are improperly capitalized.
• MC-262133 – Strong lag spikes when moving above a cleared area with exposed void.
• MC-262185 – Partially transparent pixels in font glyphs appear more opaque than they should in the tooltip.
• MC-262218 – Block light updates don't cross chunk borders properly in 23w17a.