Java Edition 18w31a

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 "field": "[https://piston-data.mojang.com/v1/objects/0a343ef39365d70908a3c59fbbf2d9c0ddd2ad75/client.jar Client] ([https://piston-meta.mojang.com/v1/packages/8b603c88a9b33a27a4c436b6b71d1740dbae4ad3/18w31a.json .json])<br />[https://piston-data.mojang.com/v1/objects/4646084899fb62a7b9afa6f453fae4e6e786e5a5/server.jar Server]",
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 "field": "<span class=\"plainlinks\">[https://en.wikipedia.org/wiki/Java_version_history#Java_SE_8_.28LTS.29 Java SE 8]</span>",
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 "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" >[[Java Edition 1.13|<span style=\"margin-right:-0.35em\">◄</span>◄  1.13]]</td>\n<td style=\"padding: 0.4em\">'''[[Java Edition 1.13.1|1.13.1]]'''</td>\n<td style=\"padding: 0.4em\" >[[Java Edition 1.13.2| 1.13.2 <span style=\"margin-right:-0.35em\">►</span>►]]</td>\n</tr>\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\">\n[[Java Edition 18w30b|◄  18w30b]]\n</td>\n<td style=\"padding: 0.4em\">''' 18w31a'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition 18w32a| 18w32a ►]]\n</td>\n</tr>\n</table>"
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18w31a is the third snapshot for Java Edition 1.13.1, released on August 1, 2018,^[1] which adds some new features, changes some existing features, optimizes performance, and fixes many bugs.

👁 Image
Chunks

• 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 tag minecraft:underwater_bonemeals.

Conduits

• Are now properly waterlogged.

Fish

• Now have a 5% chance of dropping bone meal when killed.

Squid

• 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.

Scoreboards

• 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]

Functions

• 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-134967 – NullPointerException 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.