It's been a bit, but here's a new preview! This preview changes the way buckets are defined with some minor action changes.

For a few more details regarding the split and future you can look at the roadmap to 1.21!

Changes

Item Behaviour Components

minecraft:bucket

• Unified block and fluid placement for buckets.
• The fluid, block and transforms_into fields have been replaced with world modifications in the new modification field.
  • This means that the previously hardcoded behaviour of the minecraft:empty fluid draining a fluid instead has been removed.

Previously set field	World modification
Fluid minecraft:empty	minecraft:drain_fluid
Any other fluid	minecraft:place_fluid with the specified fluid
Any block	minecraft:place_block with the specified block

• Moved the placed entity up a level by only specifying the entity type.
  • This means that the optional require_other_successful_placement field has been removed and now always requires a successful placement.
  • The field itself is still optional.

So if you had this:

{
  "minecraft:bucket": {
    "emptying_sound_event": "minecraft:item.bucket.empty_fish",
    "entity": {
      "entity": "minecraft:pufferfish",
      "require_other_successful_placement": true
    },
    "fluid": "minecraft:water",
    "transforms_into": "minecraft:bucket"
  }
}

You now have to use this instead:

{
  "minecraft:bucket": {
    "entity": "minecraft:pufferfish",
    "modification": {
      "type": "minecraft:place_fluid",
      "fluid": "minecraft:water",
      "place_sound": "minecraft:item.bucket.empty_fish",
      "transforms_into": "minecraft:bucket"
    }
  }
}

Actions

minecraft:place_block

• Removed the decrement_count field.
  • This should be replaced by a sequence with a minecraft:decrement_item action.

So if you had this:

{
  "type": "minecraft:place_block",
  "block": "minecraft:fire",
  "decrement_count": true,
  "position": "interacted"
}

You now have to use this instead:

{
  "type": "minecraft:sequence",
  "handler": "minecraft:passing",
  "entries": [
    {
      "type": "minecraft:place_block",
      "block": "minecraft:fire",
      "position": "interacted"
    },
    {
      "type": "minecraft:decrement_item",
      "amount": 1
    }
  ]
}

• Added an optional place_sound field.
  • When specified, this sound will be played instead of the normal block place sound.

World Modifications

Can modify the world by adding or removing something from it.

minecraft:drain_fluid

• Drains a fluid from the world.
• Has no additional fields.
• Leaves an item stack specified by the drained fluid.

minecraft:place_fluid

• Places a fluid in the world.
• Fields:
  • fluid: A fluid. The fluid to place.
  • place_sound: A sound event. The sound to play when placed.
  • transforms_into: An item. The item to leave when successfully placed.
• Leaves the item stack specified in the transforms_into field.

minecraft:place_block

• Places a block in the world.
• Fields:
  • block: A block picker. The block to place.
  • place_sound: A sound event. The sound to play when placed.
  • transforms_into: An item. The item to leave when successfully placed.
• Leaves the item stack specified in the transforms_into field.

Fixes

• Exchanging item stacks now works correctly again by dropping the exchanged item stack instead of the current item stack.