Write a reproducible Minecraft bug report that a project creator can use

Reproduction steps are the core evidence

“It does not work” does not tell a creator what action, environment, or result to test. A useful report begins from a known state and lists the exact steps that produce the failure. Include whether it happens every time and whether a new world reproduces it.

Separate the expected result from the actual result. This prevents misunderstandings when behavior is intentional or controlled by configuration.

Provide the right environment

Minecraft version alone is not enough. Include loader and loader version, Java version, project version, dependency versions, server/client role, and a mod list. For graphics issues, include renderer, shader, resource packs, GPU, and relevant settings.

Use a clean instance or binary-search isolation when possible. A minimal reproduction helps determine whether the project itself fails or whether another project changes the environment.

Share logs safely

Provide the complete relevant log rather than screenshots of a few red lines. Use the project tracker’s preferred paste or attachment method. Review the file for usernames, local paths, server addresses, tokens, or other private information before sharing.

Do not paste passwords, session files, authentication tokens, billing details, or private server information. A creator does not need them to diagnose a Minecraft problem.

How to know you are finished

For write a reproducible minecraft bug report that a project creator can use, the work is not finished when a file is merely downloaded. Treat it as finished when you can point to the setup you changed, explain why it matches the intended Minecraft version or platform, and repeat the result in a clean test or copied world.

Use the checklist as the exit test: official tracker is used, existing reports were searched, exact versions are included. If one of those checks is still uncertain, stop and verify that detail before moving to a main world, public server, or shared pack.

If the first failure you hit is "undefined", start with this fix: undefined This keeps recovery tied to the guide instead of turning into unrelated guesswork.