Datapack Codex

Java Edition 1.21.9 Pre-Release 2

Minecraft Wiki article. Categories: Java_Edition_versions, Java_Edition_1.21.9_pre-releases, Java_Edition_pre-releases_released_in_2025, Java_Edition_pre-releases, Pages_with_YouTube_videos

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This article is reproduced from Java Edition 1.21.9 Pre-Release 2 on the Minecraft Wiki. Mirrored from revision 3291455. It is licensed CC BY-NC-SA 3.0 by the Minecraft Wiki contributors — not under the Codex’s CC BY-SA 4.0, and it may not be used commercially. Edits belong upstream, not here.

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Minecraft 1.21.9 Pre-Release 2
1.21.9-pre2.jpg: Infobox image for Minecraft version 'Minecraft 1.21.9 Pre-Release 2'
Java Edition 1.21.9 Pre-Release 2.png: Infobox image for Minecraft version 'Minecraft 1.21.9 Pre-Release 2'
{
    "title": "Minecraft 1.21.9 Pre-Release 2",
    "images": [
        "1.21.9-pre2.jpg",
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    "rows": [
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            "label": "(link to Edition article, displayed as Edition)"
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        {
            "field": "September 19, 2025",
            "label": "Release date"
        },
        {
            "field": "(link to Pre-release article, displayed as Pre-release)",
            "label": "(link to Version types article, displayed as Type)"
        },
        {
            "field": "(link to Java Edition 1.21.9 article, displayed as 1.21.9)",
            "label": "Pre-release for"
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        {
            "field": "[https://piston-data.mojang.com/v1/objects/d8c99a813b86518f1a13d48e9e6248f8164c8a8e/client.jar Client] ([https://piston-meta.mojang.com/v1/packages/cc3e1fb90f8fa636b4197fa52f9a9b7f8679d313/1.21.9-pre2.json .json])<br />[https://piston-data.mojang.com/v1/objects/cd046af3f42191edbcc4870f11e06e95582dbbda/server.jar Server]",
            "label": "(link to Tutorial:Installing a version#Manual version installation article, displayed as Downloads)"
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        {
            "field": "[https://piston-data.mojang.com/v1/objects/5e1219088ff7bb732e5b00bd994e12cadb23b753/client.txt Client]<br />[https://piston-data.mojang.com/v1/objects/e86dffa9bbc75324d71e44a11adf8dcda686e076/server.txt Server]",
            "label": "(link to Obfuscation map article, displayed as Obfuscation maps)"
        },
        {
            "field": " <span title=\"decimal\">dec</abbr>: </span>1073742094<br /> <span title=\"hexadecimal\">hex</abbr>: </span>4000010E",
            "label": "(link to Protocol version article, displayed as Protocol version)"
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            "field": "4550",
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            "field": "69.0",
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            "field": "88.0",
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            "field": "<span class=\"plainlinks\">[https://en.wikipedia.org/wiki/Java_version_history#Java_SE_21_.28LTS.29 Java SE 21]</span>",
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}

1.21.9 Pre-Release 2 (known as 1.21.9-pre2 in the launcher) is the second pre-release for Java Edition 1.21.9, released on September 19, 2025.[1]

Changes

Mobs

Copper golem

  • The copper golem's behavior for turning into a statue has been tweaked to match Bedrock Edition.
    • Copper golems no longer need to be close to the center of an empty block position in order to turn into a statue.
    • Copper golems now have the possibility to turn into a statue as soon as they become fully oxidized.

General

Data pack

Fixes

11 issues fixed

From 1.21.8

  • MC-301770 – The below_name plate is not displayed higher for players and mannequins named “deadmau5”.

From the 1.21.9 development versions

  • MC-300362 – Copper golems do not oxidize when doDaylightCycle is disabled.
  • MC-301566 – Occasional sound crash on resource pack reload.
  • MC-301706 – Server Management Protocol does not support parameters as object (by-name).
  • MC-301963 – Copper golems cause huge lag spikes when checking chests.
  • MC-302088 – Oxidized Copper Golems take an extremely long time to turn into a statue.

From the previous development version

  • MC-302112 – Posed mannequins don't use the correct hitbox.
  • MC-302117 – Text display billboarding is broken.
  • MC-302120 – Dimension-specific world spawn point causes mob spawning in other dimensions to fail.
  • MC-302148 – Copper Golem does not get close enough to search the chest, getting permanently stuck.
  • MC-302164 – Breaking change to /setworldspawn and /spawnpoint in minor datapack version.

Videos

Video made by slicedlime:

References

  1. ↑ "Minecraft 1.21.9 Pre-Release 2" – Minecraft.net, September 19, 2025.

Sources