Troubleshooting guides

A hardcore death is one boolean in level.dat. Here is what the file holds, what a corrupted save looks like, and the honest limits of what inspection can recover.

A .mrpack is a manifest, not an archive of mods. Unzipping it gives you a JSON file and no jars. Here is what is actually inside and what a converter has to do.

One wrong integer makes Minecraft grey out your pack. Here is the format-to-version mapping, the supported_formats range that avoids the whole problem, and where the file must sit.

A datapack that does not appear in /datapack list has a path problem, not a code problem. Here is the exact tree, the namespace rule, and the folders that got renamed.