Well hello fellow Minecraft lovers! It is time for the first snapshot for 1.20. We know we promised no more major features, so how did we end up with such a big snapshot? You thought the trails were over? NO! In snapshot 23w12a we have even more tales to tell! Our devs apparently could not resist throwing in a few extra additions. Enjoy!

New Features

All features and changes from the "Update 1.20" experimental pack are now part of the game
Vibration resonance functionality has been added to Blocks of Amethyst
Added the Calibrated Sculk Sensor block
Added Suspicious Gravel, more Archaeology sites, and new Pottery Shards
Added 5 new armor trims
Signs have improved customization options
Added Sniffer Egg
Added Pitcher Plant

Vibration Resonance

Blocks of Amethyst have a new behavior when placed adjacent to Sculk Sensors
- If that Sculk Sensor receives a vibration, the Block of Amethyst will re-emit its frequency as a separate vibration at its location
This behaviour is called Vibration Resonance, and allows players to move vibration frequencies across long distances without having to recreate the vibration naturally

Calibrated Sculk Sensors

A new variant of Sculk Sensors which allows you to filter vibrations based on their frequency level
They are not found naturally and can only be crafted with 1 Sculk Sensor and 3 Amethyst Shards in the Crafting Table
One side of the Calibrated Sculk Sensor can receive a redstone signal as input
- The strength of that redstone signal is the only vibration frequency the Sculk Sensor will listen to

Archaeology

Added Suspicious Gravel block
- It has the same characteristics as Suspicious Sand
Added Suspicious Gravel to Cold Ocean Ruins
Added Suspicious Sand to Warm Ocean Ruins
- Sniffer Eggs can be found here
Added the Trail Ruins, a buried structure from a lost culture
- Four Armor trims can be found here
Added 16 Pottery Shards (so there are now 20 Pottery Shards in total)
- These have been distributed between the 5 Archaeology sites: Desert Wells, Desert Temples, Cold Ocean Ruins, Warm Ocean Ruins, and Trail Ruins

Armor Trims

New armor trim Smithing Templates have been added to the following structures:

Trail Ruins
- Wayfinder Armor Trim
- Raiser Armor Trim
- Shaper Armor Trim
- Host Armor Trim
Ancient City
- Silence Armor Trim

Signs

Sign text can now be edited after being placed in the world
- This can be done by interacting with the Sign
Both sides of the Sign can now have separate text and colors, allowing for further customization options
- By default, a Sign will prompt you to input the front side's text when placed
- To apply text to the back-side, you must walk to the other side and interact with that face to edit it
Signs can now also be waxed with Honeycomb, preventing any further edits to its text
- Click commands on Signs can only be invoked when the Sign is waxed
- If a Sign with a click command is not waxed, interacting with it will not invoke the command and instead open up the edit screen as usual

Sniffer Egg

Can be found in the Suspicious Sand of Warm Ocean Ruins
When two Sniffers breed they do not immediately spawn a Snifflet; instead, a Sniffer Egg is dropped
Hatching
- When placed on Moss, the Egg will hatch after approximately 10 minutes
- On all other blocks, it will hatch in approximately 20 minutes

Pitcher Plant

The Sniffer can now occasionally Sniff up a Pitcher Pod item
- This Pod, when planted in Farmland, grows into a Pitcher Crop, which has five growth stages
- Once fully grown, the Pitcher Crop can be harvested, yielding a two-block-tall Pitcher Plant

Changes

Vibration frequencies of many actions in the game have been tweaked
Wither effect particle color has been adjusted to make it more distinguishable
Potion of Slow Falling color has been adjusted to make it more distinguishable
Step sounds can now combine for blocks walked through and stepped on

Vibration Frequencies

In preparation for the Calibrated Sculk Sensor, vibration frequencies have been greatly simplified to prevent unwanted interference. The following are category descriptions for each frequency and the expected events that they correspond to:

Movement in any medium (land, water and air)
Landing on any surface (land or water)
Item interactions
Gliding with an elytra or unique mob actions (Ravager roar, Wolf shaking, etc)
Dismounting a mob or equipping gear
Mounting a mob or interacting with a mob
Mobs and players getting damaged
Consuming items (drinking and eating)
Blocks 'deactivating' (door close, chest close, button unpress, etc)
Blocks 'activating' (door open, chest open, button press, etc)
Blocks changing (cauldron water level rising, adding food to campfire, etc)
Blocks being destroyed
Blocks being placed
Mobs and players teleporting or spawning
Mobs and players dying or an explosion

Combination Step Sounds

Combines two different step sounds
Occurs for carpets, snow, nether sprouts, as well as warped and crimson roots
- The top-most block you are walking on is played as normal
- The block underneath is played at a lower volume and pitch

Armor Trims

The Dune Armor Trim now has a brand-new pattern and Smithing Template icon
The Dune Armor Trim's old pattern is now used by the Sentry Armor Trim
- A new icon has been made for the Sentry Armor Trim Smithing Template to fit this pattern
The Sentry Armor Trim's old pattern is now used by the new Shaper Armor Trim

Technical Changes

The data pack version is now 13, accounting for sign data format changes
Added a capped rule structure processor that limits the number of replaced blocks for a structure piece to a configured maximum
Configuring block entity fields in a rule processor rule is now delegated to a referenced block_entity_modifier instead of the previously fixed output_nbt configuration
Game events have changed vibration frequency and some have been removed
Tweaked display entity interpolation
Removed update_1_20 feature flag and built-in datapack - features are no longer experimental

Structure post-processors

Capped post-processor

A capped post-processor has been added which can limit how many blocks a delegated post-processor randomly transform in a structure
This can be used to configure a structure piece to have an exact amount of specific blocks, instead of using random distribution
The capped post-processor has following required parameters:
- delegate A post-processor which performs the actual block transformation
- limit Maximum amount of blocks that the delegated post-processor can transform
  - The blocks inside a structure are all randomly passed to the delegated post-processor until it has transformed the limited amount
  - Either constant or random number generator sampled during post-processing

Rule post-processor block entity configuration

Previously a rule could specify an optional fixed output_nbt which would be added to the processed output block entity
This field has now been changed to reference a block_entity_modifier
Existing block_entity_modifier's are:
- passthrough Retains existing fields on the block entity
  - This is the default if no block_entity_modifier is specified
- append_static Similar to previous output_nbt this provides fixed fields to add to the block entity
  - A minor change is that this modifier appends configured fields to the processed block instead of replacing existing fields
- clear Removes any existing fields on the block entity
- append_loot Appends a loot table and seed to the block entity through required parameter:
  - loot_table Referenced loot table to add to block entity as LootTable field
  - Field LootTableSeed is also added to the block entity using random seeded by block position

Game Events

piston_contract game event has been removed in favor of block_deactivate
piston_extend and dispense_fail game events have been removed in favor of block_activate
Many game events have new vibration frequencies:
- 1: step, swim, flap
- 2: projectile_land, hit_ground, splash
- 3: item_interact_finish, projectile_shoot, instrument_play
- 4: entity_roar, entity_shake, elytra_glide
- 5: entity_dismount, equip
- 6: entity_mount, entity_interact, shear
- 7: entity_damage
- 8: drink, eat
- 9: container_close, block_close, block_deactivate, block_detach
- 10: container_open, block_open, block_activate, block_attach, prime_fuse, note_block_play
- 11: block_change
- 12: block_destroy, fluid_pickup
- 13: block_place, fluid_place
- 14: entity_place, lightning_strike, teleport
- 15: entity_die, explode

Display entity

Interpolation changes

Previous values are always discarded if interpolation_duration is 0
Made sure that render properties are applied at the same time (so block_state is applied at the same time as transformation, i.e. at next tick after receiving update)
Entities are not rendered unless initial data is received. That means display entities might not show on the first tick.
Note: due to how game handles updates, changes to entities made after summoning might be delivered to clients with later tick

Fixed bugs in Snapshot 23w12a

MC-157727 The small cube in honey/slime blocks isn't displayed in inventory
MC-165221 3D Modeled Potions are not rendered correctly in the "GUI Display"
MC-197241 Players can change the color of a wolf's collar even if they're not its owner
MC-201647 Entity riding an entity can cause location/coordinate desync
MC-256488 Bamboo Raft and Raft with Chest models float above ground
MC-256551 Baby camels have a visible inventory
MC-256585 Z-fighting occurs on the text of hanging signs
MC-259201 The tops and bottoms of donkeys' ears are miscolored
MC-259879 Display entities with a rather large shadow_radius value can cause performance issues
MC-260020 Reloading the world resets the Brown Mooshroom's given flower
MC-260043 Decorated Pots don't play breaking sound in creative mode
MC-260047 Decorated pots from the creative inventory and new blank decorated pots with no NBT will match their texture to the last decorated pot you crafted
MC-260053 When rotating a decorated pot with the debug stick, it will spawn a decorated pot item
MC-260061 Sniffer's ears and head z-fight
MC-260069 Growing cherry trees inside each other causes their leaves to decay
MC-260240 Sniffers that are in love sometimes don't attempt to approach one another to breed
MC-260251 The walking animations of sniffers don't change in relation to their movement speed
MC-260282 Sniffers can sniff out and follow players in spectator mode
MC-260296 Pink petal block models are not optimized
MC-260317 Sniffers try to sniff out obstructed blocks they can't reach
MC-260320 Parity Issue: Snifflets (Baby Sniffers) have an inconsistent model with Bedrock
MC-260326 Dying sniffers continue to dig
MC-260409 Cherry Grove biome is not in the #is_overworld biome tag
MC-260503 Sniffers refuse to dig into soil with a non-solid block on top
MC-260632 Riding an entity that is far away causes client/server desync
MC-260678 Potion of Invisibility looks too similar to the Potion of Slow Falling
MC-260750 Magma blocks use unnecessary random ticking for an outdated feature, causing performance issues
MC-260757 Updating a large amount of Iron Bars causes the game to hang in-game or during the Saving world screen
MC-260777 Sniffers ignore some dangerous blocks while sniffing and pathfinding resulting in them being damaged
MC-260778 Sniffer tries to sniff out blocks outside the world border
MC-260779 Sniffers can dig into blocks outside the world border
MC-260839 Mobs can replace weapons held in their main hand with armor
MC-260885 Display entities summoned with initial transformation interpolate incorrectly from default transformation during next transformation
MC-260897 Display entity's previous state of interpolation doesn't work as expected

New Features

Vibration Resonance

Calibrated Sculk Sensors

Archaeology

Armor Trims

Signs

Sniffer Egg

Pitcher Plant

Changes

Vibration Frequencies

Combination Step Sounds

Armor Trims

Technical Changes

Structure post-processors

Capped post-processor

Rule post-processor block entity configuration

Game Events

Tags

Step Sounds

Display entity

Interpolation changes

Fixed bugs in Snapshot 23w12a

Minecraft Snapshot 23w12a