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{{Infobox version
|title=18w31a
|image =18w31a.jpg
|image2=Java Edition 18w31a.png
|edition=Java
|type=Snapshot
|date=August 1, 2018
|clienthash=0a343ef39365d70908a3c59fbbf2d9c0ddd2ad75
|jsonhash=8b603c88a9b33a27a4c436b6b71d1740dbae4ad3
|serverhash=4646084899fb62a7b9afa6f453fae4e6e786e5a5
|parent=1.13.1
|prevparent=1.13
|prev=18w30b
|next=18w32a
|nextparent=1.13.2
}}<onlyinclude>

'''18w31a''' is the third [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.13.1]], released on August 1, 2018,<ref name="18w31a">{{snap|18w31a|August 1, 2018}}</ref> which adds some new features, changes some existing features, optimizes performance, and fixes many bugs.

== Additions ==
=== General ===
'''{{EnvLink|Chunks}}'''
* Added a concept of force-loaded chunks to the game, and a command ({{cmd|chunk}}) to toggle force-loading on and off.

'''Block [[Minecraft:tag]]s'''
* Added the tag <code>minecraft:underwater_bonemeals</code>.

== Changes ==
=== Blocks ===
'''[[Minecraft:Conduit]]s'''
* Are now properly waterlogged.

=== Mobs ===
'''[[Minecraft:Fish]]'''
* Now have a 5% chance of dropping bone meal when killed.

'''[[Minecraft:Squid]]'''
* Now spawn only in rivers, oceans, or beaches.

=== Items ===
'''[[Minecraft:Bone meal]]'''
* When used in water of warm ocean biomes, it now has a chance to grow [[Minecraft:coral]].

=== Command format ===
'''[[Minecraft:Scoreboard]]s'''
* The [[Minecraft:Scoreboard#Players commands|scoreboard operator]] <code>%=</code> was changed from using Java's native <code>%</code> to using <code>Math.floorMod</code>. This causes the operator to use floored [[Minecraft:wikipedia:modulo|modulo]] instead of truncated modulo, so now <code>-1 % 7</code> wraps to 6 instead of returning -1.<ref>https://www.reddit.com/r/Minecraft/comments/93pmai/minecraft_snapshot_18w31a/e3fkwrj</ref>

'''Functions'''
* Line numbers in function parse error logs now start with 1 (was 0).

=== General ===
* Performance has been optimized.

== Fixes ==
{{fixes|fixedin=18w31a|prefix=Minecraft
|;From released versions before 1.13
|73|Green arrow bug on maps in frames.
|1528|Maps in item frames' markers aren't persistent.
|96998|End Cities / Woodland Mansions don't generate completely when interrupting generation
|112801|Players on the death screen still cause spawners to spawn.
|122939|Statistics for mining banners and beds never increase.
|128547|Minecraft keeps previously used World in memory if the player has hit any entity in that world.
|;From 1.13
|121369|Holding ESC while clicking "Multiplayer" returns user to main menu
|123021|Crash on open if "Saves" is a link
|124583|Cannot place structure void block next to another when right clicking on one
|125337|When the double-held trident throws, players will lift both hands
|130258|Maps in item frames show shading problems.
|131397|Sponges cannot remove water from conduits
|132451|Command Parser - invalid value for block property and property name are reversed in error message
|132769|Detecting a 2 redstone tick repeater with an observer block creates a 2 redstone tick pulse
|133181|Observer's cooldown is broken.
|133546|Player becomes "ghost" when dying in the nether or going through the end portal back to the overworld
|134105|Can't return from the end after defeating dragon.
|134159|Saved world causes crash in 1.13.
|134667|Async Chunk Gen dangerously adding entities to world async.
|134889|Iron golems spawn in air blocks.
|134916|Sound event <code>block.pumpkin.carve</code> doesn't play when carving normal pumpkins.
|135049|Old world doesn't save map markers in 1.13.
|135261|{{cmd|setblock}} for player heads don't show the texture after the placement.
|;dev
|134816|Crash: Exception ticking world entities
|134825|Tab completion/suggestions don't work for some non-literal arguments (in chat)
|134832|TNT with <code>unstable{{=}}true</code> blockstate is ignited instead of broken in creative mode.
|134898|Pressing Escape no longer returns to main menu from singleplayer menu.
|;prev
|134966|Using {{cmd|setblock}} to place an "Always Active" command block with a command won't execute the command immediately
|134967|<code>NullPointerException</code> when placing Wither Skeleton Skulls.
|134974|Entities in your world can randomly freeze
|134982|Exception when placing a command block.
|134987|Renaming a world doesn't update its name until re-entering the world list.
|134988|Optimizing a world doesn't update it until re-entering the world list.
|135039|The game crashes when {{cmd|setblock}}-ing a spawner with an entity ID containing capital letters
|135053|Sticky pistons get stuck when receiving a 0 gametick pulse.
|135136|Crash when placing a chain command block with set command.
|135147|Loading/saving structures with command blocks in them causes errors
|135172|Under certain conditions pistons can't be powered for the first 2 gameticks after being moved.
|135185|All redstone components can become stuck in a powered state when indirectly unpowered.
|135186|Pistons can only be re-pulsed 5 or more gameticks later.
|135194|Pistons react 1 gametick too late.
|135229|Game crash when opening Furnace
|135268|Switching to spectator mode and back creates ghost player duplicates for other players
|135293|Profiler doesn't exit section when an entity is removed, causing recursive profiling and lag
|;priv
|134716|Minecraft Multiplayer – Player kick exploit.<ref name="18w31a"/>
}}</onlyinclude>

== Videos ==
Video made by [[Minecraft:slicedlime]]:
{{yt|YTfLTKmcJXc}}

== Trivia ==
* This snapshot, being the third for 1.13.1, was released in the same week of the year as the third snapshot for 1.9, [[Minecraft:15w31c]].
* 18w31a was released exactly 6 years after [[Minecraft:Java Edition 1.3.1|1.3.1]].

== References ==
{{reflist}}

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

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Minecraft:Java Edition 18w31a - Revision history

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