How to use landscape splines with world composition?

Seems to be no documentation on this at all even though splines and World Composition have been in Unreal Engine for more than a few years now.
I can’t get this working. If I extend a road spline over more then one landscape in world composition, it extends my level bounds which then throws off World composition if I add more landscape tiles.
It seems to split the spline components onto each landscape because if I move the landscape in the minimap, the road splines move with it, but only the road segments that are sitting on that landscape move, the rest of the road mesh (without the splines) stays attached to the other landscape that wasn’t moved.

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