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{{Infobox version
|title=Minecraft 21w44a
|image=21w44a.jpg
|image2=Java Edition 21w44a.png
|edition=Java
|type=Snapshot
|date=November 3, 2021
|jsonhash=fd990561a3502903a819815ca63b7ac13110a84c
|clienthash=6bf2feca56785edfddf308cbeef0fc3331155685
|clientmap=7e7ead13deb9d525c9764f933fb11cd76b7b79ae
|serverhash=ae583fd57a8c07f2d6fbadce1ce1e1379bf4b32d
|servermap=122dd671c989bd1f0247c0d2924f45ea41595c71
|parent=1.18
|prevparent=1.17.1
|prev=21w43a
|next=1.18 Pre-release 1
|nextparent=1.18.1
}}<onlyinclude>

'''21w44a''' is the eighth and final [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.18]], released on November 3, 2021,<ref>{{snap|21w44a|November 3, 2021}}</ref> which improves the upgrading of old worlds, introduces new options, makes some tweaks, and fixes bugs. This is the final snapshot released in 2021.

== Additions ==
=== World generation ===
'''Upgrading of old worlds'''
* [[Minecraft:Cave]]s are now inserted under existing chunks when upgrading a world to the new world height.
** Deepslate and the bedrock layer currently don't generate due to a bug.<ref>{{bug|MC-240481}}</ref>
* Large biomes and amplified worlds now have an upgrade path, and retain more of their characteristics when upgraded to the new terrain system.

=== General ===
'''[[Minecraft:Options]]'''
* Added "Online Options" as a separate screen:
** The "Realms Notifications" option has been moved to this screen.
** Contains the new "Allow Server Listings" option.
*** When deactivated, the player name doesn't show up in server online player listings.
** Contains the new "Server Difficulty" option, to indicate the difficulty of the current server.

'''[[Minecraft:server.properties]]'''
* Added <code>hide-online-players</code>, which when set to "True", doesn't send a player list on status requests.

'''[[Minecraft:Tags]]'''
* Added following block tags to decide the corresponding creatures to spawn:
** <code>animals_spawnable_on</code>
*** Contains [[Minecraft:grass block]].
** <code>axolotls_spawnable_on</code>
*** Contains [[Minecraft:clay]].
** <code>foxes_spawnable_on</code>
*** Contains grass block, [[Minecraft:snow]], [[Minecraft:snow block]], [[Minecraft:podzol]], and [[Minecraft:coarse dirt]].
** <code>goats_spawnable_on</code>
*** Contains [[Minecraft:stone]], snow, [[Minecraft:powder snow]], snow block, [[Minecraft:packed ice]], and [[Minecraft:gravel]].
** <code>mooshrooms_spawnable_on</code>
*** Contains [[Minecraft:mycelium]].
** <code>parrots_spawnable_on</code>
*** Contains grass block, [[Minecraft:air]], [[Minecraft:Tag#blocks leaves|#leaves]], and [[Minecraft:Tag#blocks logs|#logs]].
** <code>polar_bears_spawnable_on_in_frozen_ocean</code>
*** Contains [[Minecraft:ice]].
** <code>rabbits_spawnable_on</code>
*** Contains grass block, snow, snow block, and [[Minecraft:sand]].
** <code>wolves_spawnable_on</code>
*** Contains grass block, snow, and snow block.

== Changes ==
=== Gameplay ===
'''[[Minecraft:Advancement]]s'''
* All 50 Overworld biomes are now required to be visited for the Adventuring Time advancement, including the following biomes which were previously not required:
:{| class="wikitable collapsed collapsible"
! Required biomes
|-
| {{BiomeLink|Deep Ocean}}
|-
| {{BiomeLink|Dripstone Caves}}
|-
| {{BiomeLink|Eroded Badlands}}
|-
| {{BiomeLink|Flower Forest}}
|-
| {{BiomeLink|Frozen Ocean}}
|-
| {{BiomeLink|Frozen Peaks}}
|-
| {{BiomeLink|Grove}}
|-
| {{BiomeLink|Ice Spikes}}
|-
| {{BiomeLink|Jagged Peaks}}
|-
| {{BiomeLink|Lush Caves}}
|-
| {{BiomeLink|Meadow}}
|-
| {{BiomeLink|Ocean}}
|-
| {{BiomeLink|Old Growth Birch Forest}}
|-
| {{BiomeLink|Old Growth Spruce Taiga}}
|-
| {{BiomeLink|Snowy Slopes}}
|-
| {{BiomeLink|Stony Peaks}}
|-
| {{BiomeLink|Sunflower Plains}}
|-
| {{BiomeLink|Windswept Gravelly Hills}}
|-
| {{BiomeLink|Windswept Savanna}}
|}

'''[[Minecraft:Weather]]'''
* Sleeping now only resets the weather cycle if the weather is [[Minecraft:rain]] or a [[Minecraft:thunderstorm]].

=== World generation ===
'''[[Minecraft:Deepslate]]'''
* Now the gradual transition from stone starts at height between Y=0 to Y=8, rather than Y=-8 to Y=0 previously.

=== General ===
'''JFR profiling'''
* If it is started from an external source, the JFR events for network packets are now aggregated instead of one event per packet.

'''Simulation distance'''
* Blocks and fluids are now also affected.
* Increased the lower limit for simulation distance from 2 chunks to 5 chunks.

'''General'''
* Optimized entity collisions.

== Fixes ==
{{fixes|fixedin=21w44a
|;old
|63340|Sleeping always resets time until rain.
|170551|[[Minecraft:Fox]]es can't spawn on podzol or coarse dirt.
|187716|Nether biome surface builder types incorrectly assume the world height is 128 blocks.
|190285|"<code>bedrock_roof_position</code>" tag number does not represent height, but height modifier.
|200494|In [[Minecraft:mineshaft]]s, [[Minecraft:torch]]es can generate attached to blocks other than the wooden supports.
|216432|Mineshafts can generate with light but without any torches.
|216561|Torches not spawning in abandoned mineshafts under Y{{=}}0.
|238877|Deep ocean and ocean are not needed for the "Adventuring Time" advancement.
|238966|Old growth spruce taiga and old growth birch forest aren't a part of the "Adventuring Time" advancement.
|238968|Windswept gravelly hills and windswept savanna aren't a part of the "Adventuring Time" advancement.
|;dev
|236701|New mountain biomes don't count towards "Adventuring Time" advancement.
|236938|{{cmd|jfr stop}} output does not have a link.
|237986|[[Minecraft:Mob]]s specific to structures aren't spawning in their structures.
|238062|Foxes and wolves don't spawn in groves.
|238761|Adventuring Time does not account for the new cave biomes.
|238900|Values of <code>Infinity</code> in noise settings in default worldgen.
|238912|[[Minecraft:Powder snow]] strips can't generate exposed to the surface.
|238962|[[Minecraft:Iceberg]]s go all the way to ocean floor.
|239280|[[Minecraft:Wither]]s do not move down to follow the player when the wither's health is half or lower.
|239344|All torches in mineshafts are facing the wrong way.
|239359|[[Minecraft:Wither skeleton]]s can only spawn on Nether bricks.
|239689|The "amplified" boolean in noise settings does nothing.
|;previous
|239854|[[Minecraft:Nether]] and caves world is missing [[Minecraft:bedrock]].
|239858|Nether decorations can be generated on the original bedrock layer.
|239866|Terrain shaper in <code>noise_settings</code> is not used.
|239876|[[Minecraft:Map]]s appear gray when opened in old terrain after conversion.
|239882|[[Minecraft:Beacon]]s deactivate when upgrading worlds.
|239902|Weather effects appear in caves and structures in 1.17.1 worlds loaded in 21w43a.
}}</onlyinclude>

== Videos ==
{{Slicedlime|tDX-nIkDkR8|dPDeWk87CSE}}

== References ==
{{Reflist}}

== Navigation ==
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