Versions
WorldEdit version: 1.6
Platform version: Forge 1.12.2

I can import any package but those in io produce an error.

To Reproduce

importPackage(Packages.com.sk89q.worldedit) //works
importPackage(Packages.com.randompackage) //works

importPackage(Packages.io.github.terra121) //doesn't work
importPackage(Packages.io.randompackage) //doesn't work

Expected behavior
Should import every package

Screenshots
console output:

Java class
"net.minecraft.network.play.server.SPacketMultiBlockChange"
has no public instance field or method named "github"

Old versions are generally unsupported, unless someone else wants to backport 5277f99 to the 1.12.2 branch

If someone wants to they can open a PR, but I'm not going to consider this an active issue.