Datapack Codex

Java Edition 1.21.9 Pre-Release 4

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 4 on the Minecraft Wiki. Mirrored from revision 3301630. 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 4
1.21.9-pre4.jpg: Infobox image for Minecraft version 'Minecraft 1.21.9 Pre-Release 4'
Java Edition 1.21.9 Pre-Release 4.png: Infobox image for Minecraft version 'Minecraft 1.21.9 Pre-Release 4'
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    "title": "Minecraft 1.21.9 Pre-Release 4",
    "images": [
        "1.21.9-pre4.jpg",
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    "rows": [
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            "label": "(link to Edition article, displayed as Edition)"
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        {
            "field": "September 23, 2025",
            "label": "Release date"
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            "label": "(link to Version types article, displayed as Type)"
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            "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/8e18f8c4678f2ebabebe5900727e2145396eb13f/client.jar Client] ([https://piston-meta.mojang.com/v1/packages/5726671aced7dceedeaf8731fdd4ad48f7f4c9e5/1.21.9_Pre-Release_4.json .json])<br />[https://piston-data.mojang.com/v1/objects/b3aeb3c37aee8d24dde8fbcdba090ccc6987f48f/server.jar Server]",
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            "field": "[https://piston-data.mojang.com/v1/objects/c5efd9d133d8b518235727e57279f136d424b802/client.txt Client]<br />[https://piston-data.mojang.com/v1/objects/57c81a3b9538704b18874f48c976cd1895e4d344/server.txt Server]",
            "label": "(link to Obfuscation map article, displayed as Obfuscation maps)"
        },
        {
            "field": " <span title=\"decimal\">dec</abbr>: </span>1073742096<br /> <span title=\"hexadecimal\">hex</abbr>: </span>40000110",
            "label": "(link to Protocol version article, displayed as Protocol version)"
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            "field": "4552",
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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 4 (known as 1.21.9-pre4 in the launcher) is the fourth and final pre-release for Java Edition 1.21.9, released on September 23, 2025.[1]

Changes

Debug menu

  • The debug options screen is now accessible using F3 + F6 instead of F3 + F5.

Fixes

7 issues fixed

From the 1.21.9 development versions

  • MC-300216 – The new F3 + F5 debug settings menu does not open on Mac keyboards.
  • MC-301735 – Server Management Protocol Kick command parameter mis match.
  • MC-302039 – Conduits don't have the block-breaking animation.
  • MC-302119 – Shield with patterns has no enchantment glint when enchanted.
  • MC-302130 – Mobs have visual glitches all over them.
  • MC-302170 – Player Heads do not Glow.
  • MC-302240 – Bugs on ranged weapons.

Videos

Video made by slicedlime:

References

  1. ↑ "Minecraft 1.21.9 Pre-Release 4" – Minecraft.net, September 23, 2025.

Sources