Minecraft Wiki

The Minecraft Wiki is no longer considered as official by Microsoft and therefore several changes are required to be made, including to the wiki's logo. Please read this announcement for more information.


Minecraft Wiki
Minecraft Wiki
Java Edition 18w31a.png

Java Edition



Release date

August 1, 2018

Snapshot for



Client (.json)

Protocol version


Data version


18w31a[1] is the third snapshot released for Java Edition 1.13.1, which adds some new features, changes some existing features, optimizes performance, and fixes many bugs.



  • Added a concept of force-loaded chunks to the game, and a command (/chunk) to toggle force-loading on and off.
Block tags
  • Added the block tag minecraft:underwater_bonemeals.



  • Are now properly waterlogged.


  • Now have a 5% chance of dropping bone meal when killed.
  • Now spawn only in rivers, oceans, or beaches.


Bone meal
  • When used in water of warm ocean biomes, it now has a chance to grow coral.

Command format[]

  • The scoreboard operator %= was changed from using Java's native % to using Math.floorMod. This causes the operator to use floored modulo instead of truncated modulo, so now -1 % 7 wraps to 6 instead of returning -1.[2]
  • Line numbers in function parse error logs now start with 1 (was 0).


  • Performance has been optimized.


45 issues fixed
From released versions before 1.13
  • MC-73 – Green arrow bug on maps in frames.
  • MC-1528 – Maps in item frames' markers aren't persistent.
  • MC-96998 – End Cities / Woodland Mansions don't generate completely when interrupting generation
  • MC-112801 – Players on the death screen still cause spawners to spawn.
  • MC-122939 – Statistics for mining banners and beds never increase.
  • MC-128547 – Minecraft keeps previously used World in memory if the player has hit any entity in that world.
From 1.13
  • MC-121369 – Holding ESC while clicking "Multiplayer" returns user to main menu
  • MC-123021 – Crash on open if "Saves" is a link
  • MC-124583 – Cannot place structure void block next to another when right clicking on one
  • MC-125337 – When the double-held trident throws, players will lift both hands
  • MC-130258 – Maps in item frames show shading problems.
  • MC-131397 – Sponges cannot remove water from conduits
  • MC-132451 – Command Parser - invalid value for block property and property name are reversed in error message
  • MC-132769 – Detecting a 2 redstone tick repeater with an observer block creates a 2 redstone tick pulse
  • MC-133181 – Observer's cooldown is broken.
  • MC-133546 – Player becomes "ghost" when dying in the nether or going through the end portal back to the overworld
  • MC-134105 – Can't return from the end after defeating dragon.
  • MC-134159 – Saved world causes crash in 1.13.
  • MC-134667 – Async Chunk Gen dangerously adding entities to world async.
  • MC-134889 – Iron golems spawn in air blocks.
  • MC-134916 – Sound event block.pumpkin.carve doesn't play when carving normal pumpkins.
  • MC-135049 – Old world doesn't save map markers in 1.13.
  • MC-135261/setblock for player heads don't show the texture after the placement.
From the 1.13.1 development versions
  • MC-134816 – Crash: Exception ticking world entities
  • MC-134825 – Tab completion/suggestions don't work for some non-literal arguments (in chat)
  • MC-134832 – TNT with unstable=true blockstate is ignited instead of broken in creative mode.
  • MC-134898 – Pressing Escape no longer returns to main menu from singleplayer menu.
From the previous development version
  • MC-134966 – Using /setblock to place an "Always Active" command block with a command won't execute the command immediately
  • MC-134967NullPointerException when placing Wither Skeleton Skulls.
  • MC-134974 – Entities in your world can randomly freeze
  • MC-134982 – Exception when placing a command block.
  • MC-134987 – Renaming a world doesn't update its name until re-entering the world list.
  • MC-134988 – Optimizing a world doesn't update it until re-entering the world list.
  • MC-135039 – The game crashes when /setblock-ing a spawner with an entity ID containing capital letters
  • MC-135053 – Sticky pistons get stuck when receiving a 0 gametick pulse.
  • MC-135136 – Crash when placing a chain command block with set command.
  • MC-135147 – Loading/saving structures with command blocks in them causes errors
  • MC-135172 – Under certain conditions pistons can't be powered for the first 2 gameticks after being moved.
  • MC-135185 – All redstone components can become stuck in a powered state when indirectly unpowered.
  • MC-135186 – Pistons can only be re-pulsed 5 or more gameticks later.
  • MC-135194 – Pistons react 1 gametick too late.
  • MC-135229 – Game crash when opening Furnace
  • MC-135268 – Switching to spectator mode and back creates ghost player duplicates for other players
  • MC-135293 – Profiler doesn't exit section when an entity is removed, causing recursive profiling and lag
Private issues
  • MC-134716 – Minecraft Multiplayer – Player kick exploit.[1]


Video made by slicedlime:


  • 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, 15w31c.
  • 18w31a was released exactly 6 years after 1.3.1.