Java Edition 18w30a

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 "field": "[https://piston-data.mojang.com/v1/objects/d368609e838cb1b22e1e1e9eee8f83dbe4847909/client.jar Client] ([https://piston-meta.mojang.com/v1/packages/dc1939cbbccabdfa7c5a19bcad0109351d175f1e/18w30a.json .json])<br />[https://piston-data.mojang.com/v1/objects/4cfe675115064caad14712c3345660f4069a2e8b/server.jar Server]",
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 "invimages": [],
 "footer": "<table style=\"margin: auto; word-break: break-word;\">\n<tr style=\"background: inherit;\">\n<td style=\"padding: 0.4em\" rowspan=\"2\">[[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\n<td style=\"padding: 0.4em\">''' 18w30a'''</td>\n<td style=\"padding: 0.4em\">\n[[Java Edition 18w30b| 18w30b ►]]\n</td>\n</tr>\n</table>"
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18w30a is the first snapshot for Java Edition 1.13.1, released on July 25, 2018,^[1] which adds a search bar in the world list and a few other things, and fixes many bugs.

Blocks

• Re-added punch-to-explode TNT using the unstable state (instead of the explode state in 1.12).

Gameplay

• Added a search bar in the world list.

Debug screen

• Added  +  +  to force a JVM crash, instead of a regular crash. However, with some keyboards it only triggers with right control.^[2]

Fonts

• The missing font character has been changed from 👁 Image
  to 👁 Image
  - it is now empty on the inside rather than black.

49 issues fixed

From released versions before 1.13

• MC-33383 – Lag while taking screenshot with F2 in singleplayer.
• MC-59517 – TNT explode=true blockstate drops TNT item when fused by hit in survival mode.
• MC-84005 – Book and quill doesn't save changes when edited in offhand.
• MC-88099 – Slimes/Magma cube with NoAI-Tag still can damage the player.
• MC-88356 – Bow animation broken in off-hand in third person.
• MC-119971 – Various duplications, deletions, and data corruption at chunk boundaries, caused by loading outdated chunks — includes duping and deletion of entities/mobs, items in hoppers, and blocks moved by pistons, among other problems.
• MC-124942 – "Invalid book tag" is not translatable.

From 1.13

• MC-122563 – Disappearance of the old "punchable" TNT.
• MC-122625 – Order of contents of north- and east-facing double chests changed after update 1.12.2 -> 1.13.
• MC-123806 – Tab-completion/command suggestions only work for the final argument.
• MC-124543 – JSON-Text formatting in CustomNames of container blocks does not work.
• MC-124681 – Tab suggestion erroneously suggests second closing square bracket on entity selectors.
• MC-124690 – Successful /bossbar set players doesn't give success message in chat.
• MC-124808 – Blocks don't pop off when their support blocks are moved by pistons.
• MC-124917 – Selector suggestions do not disappear after adding the closing bracket.
• MC-125134 – Server crashes while generating new chunks – java.util.concurrent.ExecutionException: We are asking a region for a chunk out of bound.
• MC-125286 – Block state suggester does not include '=' for first key.
• MC-129754 – Putting down lava freezes everything and then crashes the game when quitting.
• MC-131029 – Villager door detection range has changed.
• MC-131462 – Coordinate math error causes structure not to generate and possibly other issues.
• MC-131678 – Setblock property - block and setblock property - value are reversed in error messages.
• MC-131868 – Concrete powder next to waterlogged blocks is not converted to concrete.
• MC-132663 – Command blocks kick player when entering certain commands > 256 characters in multiplayer.
• MC-132664 – Obfuscated text uses same random character each frame for each input character.
• MC-132703 – Iron golems do not spawn in center of village.
• MC-132898 – Multiple layers of falling gravity blocks break.
• MC-133251 – Curse enchantments don't use red text.
• MC-133260 – Obfuscated text characterset limited to simple ASCII.
• MC-133345 – Some bolded obfuscated characters causes text to jitter
• MC-133452 – Copying, pasting, etc. still insert "c", "v", etc..
• MC-133587 – Deleting server format error.
• MC-133715 – Thrown tridents cannot be picked up after dying.
• MC-133839 – Crash when tp/at world border.
• MC-133871 – Waterlogged trapdoors do not update properly when opened.
• MC-133894 – Drowned don't drop items that they picked up as zombie then were converted.
• MC-133905 – Large oak trees generate without making block under stump dirt.
• MC-133942 – 1.13 Release is called a snapshot when backing up world.
• MC-133959 – Credits don't appear when clicking "Copyright Mojang AB" in the title screen.
• MC-133986 – Non [a-z0-9/. _ -] character in path of location: minecraft:EntityHorse.
• MC-133995 – Transferring world from 1.12.2 to 1.13 isn't working.
• MC-134166 – Villager door detection order has changed.
• MC-134297 – Observers detect moved blocks late in 1.13.
• MC-134298 – Observers don't detect retracting sticky pistons.
• MC-134300 – Inconsistency with update order when pistons retract other pistons.
• MC-134348 – Crash while upgrading: bkv{block=Block{minecraft:acacia_slab}, properties=[type, waterlogged]} has no property: half.
• MC-134414 – Concrete powder falling onto sea grass just replaces it.
• MC-134468 – Map cloning recipe only yields 2 maps.
• MC-134555 – Sticky piston does not update gravity blocks
• MC-134570 – Door top half missing when updating to new version.

Video made by slicedlime: