Before v8 worldborders, branching BO4 customstructures would spawn only inside world borders. This was useful for making fixed size dimensions containing a few customstructures. Presets like Wildlands use branching BO4 customstructures for landscape features, which should continue beyond world borders, so v8 removed the world border constraint. It would be nice to make this an optional feature for BO4's though, to make sure that the customstructure and all its branches spawn within world borders (dungeons etc).

Implemented for 9.0_r1