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Fix MC-139908

by FallingUser

Fix MC-139908 is a server-side Fabric fix that corrects advancement selector parsing for a Minecraft bug.

FabricServer-side onlyGNU Affero General Public License v3.0 or laterOpen source26.1 – 26.3

What it does

The mod addresses bug MC-139908, where advancement selector entity selectors are only parsed successfully for a limited subset of characters. Criteria names containing characters outside that subset cannot be entered, and the fix changes the parser so such selectors are handled correctly. Only the server needs the mod, so players join without installing anything. Files cover 26.1 – 26.3 under the GNU Affero General Public License v3.0 or later, and the code is open source.

Key features

  1. Selector parsing fix

    Corrects the parser so advancement selectors accept entity selectors beyond the previously supported character subset.

  2. Criteria names with symbols

    Criteria names that include characters such as minecraft:the void or minecraft:jungle can be entered in commands.

  3. Server-side install

    Only the server needs the fix, and clients connect without installing anything.

Compatibility

Latest build for each game version and loader.

26.31.0_4_26.2
26.21.0_4_26.2
26.1.21.0_4_26.1
26.1.11.0_4_26.1
26.11.0_4_26.1
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

How it compares

Full comparison

Do I Reload? is a client-side Fabric and Quilt mod for 26.2 – 26.3 under the GNU Lesser General Public License v2.1 only, so it does not touch the server. It differs from this fix in both environment and version range.

ModLoadersGame versionsEnvironmentUpdated
Fix MC-139908Fabric26.1 – 26.3Server-side only2026-06-20
Do I Reload?Fabric and Quilt26.2 – 26.3Client-side only2026-09-18

Questions

Does Fix MC-139908 need to be installed on clients?

No. Server owners install it, and players connect with no copy of their own.

Which game versions does Fix MC-139908 support?

Files exist for 26.1, 26.1.1, 26.1.2, 26.2 and 26.3. The latest Fabric file is 1.0_4_26.2 for 26.3, published 2026-06-20.

In the catalog

Fix MC-139908 is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 8,071 mods support Minecraft 26.3.

Optimization mods3,545Fabric modsMods for 26.38,071

More from FallingUser

All projects
Achievements26.1 – 26.3

Similar mods

Sodium1.16.3 – 26.3Iris Shaders1.16.5 – 26.3Entity Cullingb1.7.3 – 26.3FerriteCore1.16.5 – 26.3ImmediatelyFast1.18.2 – 26.3Sodium Extra1.16.2 – 26.3

What the author says

MC-139908 is a bug that makes the advancement selector in entity selectors can only be parsed successfully if they are made up of a limited subset of characters, and the subset of characters do not include ":" so that you cannot enter a criteria name with ":" such as "minecraft:the_void" and "minecraft:jungle".
FallingUser, on the Modrinth page

Official listing

Owner
FallingUser
Published
2026-04-18
Updated on Modrinth
2026-06-20
Facts verified
2026-10-15

Tags

LibraryOptimization
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