No PCG when packaging World Partition

When I created my first map, it was 1009. At that size, I was able to cover it with a PCG Volume that worked great. I could even package it and play it; and it looked just like it does in the engine.

I up-scaled to 4033 and it was too much to load in all at once, so I chose to do the World Partition. I found the check mark that would load the PCG as the world loaded in. Everything was looking great… until I tried to package it. All I end up with is landscape; no PCG in the package.

What silly thing am I missing? Thanks,