1.21.11-SNAPSHOT fails to build — mixin remap error on class_2560/class_3830

[salamanderius77]

Describe the bug

Building an addon against meteordevelopment:meteor-client:1.21.11-SNAPSHOT with yarn 1.21.11+build.3 fails during dependency processing with:

Cannot remap onEntityCollision because it does not exists in any of the targets [net/minecraft/class_2560]
Cannot remap method_9548 because it does not exists in any of the targets [net/minecraft/class_2560]
Cannot remap onEntityCollision because it does not exists in any of the targets [net/minecraft/class_3830]
Cannot remap method_9548 because it does not exists in any of the targets [net/minecraft/class_3830]

This corrupts the mapped Minecraft jar, causing every net.minecraft.* import to fail afterward with "package net.minecraft does not exist" in downstream compilation. Reproduced across multiple independent addon repos with identical minecraft/yarn/meteor version pins, over several days, so this doesn't appear to be a transient issue.

Steps to reproduce

1. Set up a Meteor addon project targeting Minecraft 1.21.11, with yarn mappings 1.21.11+build.3
2. Run ./gradlew build
3. Build fails during dependency processing with "Cannot remap onEntityCollision" errors on class_2560 and class_3830, which then cascades into every net.minecraft.* import failing to resolve during compilation

Meteor Version

1.21.11-SNAPSHOT

Minecraft Version

1.21.11

Operating System

Windows

Before submitting a bug report

• This bug wasn't already reported (I have searched bug reports on GitHub).

• This is a valid bug (I am able to reproduce this on the latest dev build).

[Big-Iron-Cheems]

1.21.11 is not the latest dev build, that would be 26.1.2-41, closing as invalid.