Minecraft:Java Edition 1.12-pre1

1.12-pre1 is the first pre-release for Minecraft:Java Edition 1.12, released on May 10, 2017,<ref>Template:Mcnet</ref> which adds four new advancements, optimizes the recipe book and fixes bugs. This is the first pre-release released in 2017.

Additions

Mobs

Minecraft:Parrot

• Added new Minecraft:attribute: generic.flyingSpeed.
  • Due to this their generic.movementSpeed has been lowered from 0.40 to 0.20.

Gameplay

Minecraft:Gamerule

• gameLoopFunction <namespace:path/to/function/file>
  • Runs a function every Minecraft:tick through the server.

Command format

• Runs a function once through the Minecraft:entity or Minecraft:command block which ran the /function command.

General

Minecraft:Advancements

• Added 4 new advancements:

• Added Template:Nbt field to advancement display info, defaults to false.
• Added new effects_changed, used_totem, nether_travel advancements triggers.
• Added Template:Nbt to advancement rewards.

Functions

• Added new function system, which are plaintext files in world/data/functions/namespace/file.txt.
• Functions are a list of Minecraft:commands, one line per command, with // or # comment support.

Minecraft:NBT format

• Added the Template:Nbt tag for Minecraft:players.

Changes

Minecraft:Advancements

• Advancement trees are now centered in the UI.
• Minecraft:Items & Minecraft:entities in advancements have an extra NBT field (string NBT, like in commands).
• Entities in advancements have an extra effects and location field.
• Removed commands from advancement rewards.
• Removed arbitrary_player_tick advancement trigger.

Minecraft:Recipe books

• Optimized the recipe book.

Trivia

• 1.12-pre1 was previously removed from the Minecraft:launcher for some time, but was added back in September 2018.