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{{Infobox version
|title=Minecraft 20w49a
|image=20w49a.jpg
|image2=Java Edition 20w49a.png
|edition=Java
|type=Snapshot
|date=December 2, 2020
|clienthash=818705401f58ee4df2267bf97fa2e0fb6e78ce28
|jsonhash=13ef29a79cc0512e124963fd964e44fd11efe369
|serverhash=2fc0afe1fd31ca872761efbd2a7f635db234b359
|clientmap=141219c3dd05268d559a5e17e8b8f1f0bf982598
|servermap=0b30deba62ef6c2064dfd12f4f46b9d6388d9c8c
|parent=1.17
|prevparent=1.16.5
|prev=20w48a
|next=20w51a
|nextparent=1.17.1
}}<onlyinclude>

'''20w49a''' is the fourth [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.17]], released on December 2, 2020,<ref>{{snap|20w49a|December 2, 2020}}</ref> which adds [[Minecraft:sculk sensor]]s, the [[Minecraft:dripstone caves]] biome, and the ability to expand the world height limit and fixes bugs.

== Additions ==
=== Blocks ===
'''[[File:Sculk Sensor JE1.gif|32px]] [[Minecraft:Sculk sensor]]'''
* A new redstone component.
* Detects vibrations, and emits a redstone signal.
* Emits a different strength if connected to a [[Minecraft:comparator]], and the signal strength is based on the vibration's frequency.
* Vibrations can be occluded using [[Minecraft:wool]] blocks.
* Can only be obtained via the [[Minecraft:Creative inventory]] or commands such as {{cmd|give}}.

=== World generation ===
'''{{BiomeLink|Dripstone caves}}'''
* A new underground [[Minecraft:biome]].
* Made up of primarily [[Minecraft:dripstone block]]s and [[Minecraft:stone]], with large clusters of dripstone blocks hanging from the ceiling, [[Minecraft:pointed dripstone]] on the floor and ceiling and many pools of water.
* Does not generate naturally in normal worlds, and can only be generated using [[Minecraft:buffet]] worlds with "Dripstone caves" selected as the source biome or using [[Minecraft:custom]] world.

=== Gameplay ===
'''[[Minecraft:Death messages]]'''
* Added death messages for being skewered by a falling stalactite:
** "<player> was skewered by a falling stalactite"
** "<player> was skewered by a falling stalactite whilst fighting <entity>"

'''[[Minecraft:Particle]]s'''
* New particle types: <code>vibration</code> and <code>dust_color_transition</code>

=== General ===
'''[[Minecraft:Tag]]s'''
* Added the <code>dripstone_replaceable_blocks</code> block tag.
** Contains the <code>base_stone_overworld</code> block tag and dirt.
** Used in dripstone generation to determine what dripstone can replace and what pointed dripstone can generate on.
* Added the <code>occludes_vibration_signals</code> block tag.
** Contains the <code>wool</code> block tag.
** Blocks in this tag prevent sculk sensors from hearing vibrations if the block is between the sculk sensor and the vibration.
* Added new <code>game_events</code> tag type.
* Added the <code>ignore_vibrations_stepping_carefully</code> game event tag.
** Contains the step, falling, and shooting projectile events.
** Game events in this tag are ignored by sculk sensors if the source entity is sneaking.
* Added the <code>vibrations</code> game event tag.
** Contains every game event.
** Game events in this tag trigger sculk sensors.

== Changes ==
=== Blocks ===
'''[[Minecraft:Pointed dripstone]]'''
* When in a dimension with <code>ultrawarm</code> set to true, such as the [[Minecraft:Nether]], downwards facing dripstone creates lava particles instead of water particles.

=== Items ===
'''[[Minecraft:Bundle]]'''
* Fullness is now always shown even if [[Minecraft:advanced tooltips]] are disabled.

=== Gameplay ===
'''[[Minecraft:Absorption]] effect'''
* The yellow absorption hearts now stay yellow if the player has the [[Minecraft:Poison]] or [[Minecraft:Wither (status effect)|Wither]] effects, instead of appearing empty.

'''[[Minecraft:Freezing]]'''
* Frozen hearts now appear in [[Minecraft:Hardcore]] mode.
** However, they appear the same as normal frozen hearts.

=== General ===
'''[[Minecraft:Custom dimension]]s'''
* Added <code>height</code> and <code>min_y</code> variables to dimension types, allowing for the height limit to be increased in custom world settings.
** The [[Minecraft:void]] now starts 64 blocks below <code>min_y</code>.

'''Servers'''
* Removed the <code>max-build-height</code> server setting.

== Fixes ==
{{Fixes|fixedin=20w49a
|;old
|18880|The Absorption effect has no texture for poison/wither hearts (appears empty instead).
|46650|When flying through blocks in spectator mode in {{key|F5}}, the camera zooms in and out a lot.
|201840|Optional function tags sometimes don't run even when the tag exists.
|;dev
|203797|Placing or removing a block over the void causes a <code>DecoderException</code> on servers.
|204314|Double copper slabs only drop a single slab when mined.
|205043|Absorption hearts appear broken when taking freezing damage.
|205096|Hardcore hearts lose all color when player is taking freeze damage.
|205391|Waxing cut copper does not prevent it from oxidising.
|205629|Unused sign cache when rendering signs.
|;previous
|206553|Pointed Dripstone creates water particles in the Nether.
|206563|Pointed dripstone is not connected to the player's hand.
|206578|Large pillars of stalactites don't fall when the block above is removed.
|206583|Cauldrons below stalactites at least 2 blocks tall will not fill up.
|206591|Setting any floating block to a pointed dripstone, causes the replaced block to drop as an item.
|206594|Large stalactites falling occasionally do not drop all of their pointed dripstone items.
|206606|Frustum stage of stalactites negates fall damage.
|206613|Pointed Dripstone duplicates when the block it was attached to is removed.
|206615|Pointed dripstone's hitbox can extend further than a block, causing nearby stalactites to not be able to fall.
|206642|Stalactites destroy items they fall on, however stalagmites don't.
|206643|When a dripstone's hitbox extends into the space of another block, the area that extends into said block cannot be targeted.
|206669|Inconsistency between dripstone and non-mob entities.
|206682|Floating dripstone tips are sometimes left behind from large dripstone pillars.
|206689|Floating pointed dripstone top.
|206691|Pointed dripstone replaces items with pointed dripstone items.
|206711|Coding error at <code>net.minecraft.world.entity.Entity.resetPos()</code>.
|206790|Waterlogged dripstone does not update.
|206878|Pointed dripstone attached to a piston is not removed as the piston extends.
|206961|Flashing frozen hearts use the poisoned absorption heart texture.
}}</onlyinclude>

== Videos ==
{{slicedlime|6t2sjwuzjTc}}

== References ==
{{Reflist}}

== Navigation ==
{{Navbox Java Edition versions|1.1x}}

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Minecraft:Java Edition 20w49a - Revision history

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