Issue Description:

I tried (roughly) the following code:

if (tileentity.getClass().getName().startswith("enderio")) {
    World oldWorld = tileentity.worldObj;
    tileentity.worldObj = new FakeWorld() {
        public TileEntity getTileEntity(BlockPos bp) {
            return new DummyTileEntity(itemStack);
        }
    };
    tileentity.update();
    tileentity.worldObj = oldWorld;
}

and it crashed.

What happens:

It crashes.

What you expected to happen:

Power to go into my seeds.

Steps to reproduce:

1. Uh. Write a mod that does the above? I'm not gonna publish this code because IT CRASHES.

Affected Versions (Do not use "latest"):

No, seriously, can we just get PULL? This is getting kinda ridiculous, isn't it?

Use broken code get broken results. We just so happen to explicitly prevent hacky crap like this, but in any mod it would eventually fail, just less obviously so. Your 3 strikes are up.