SplineNavModifier is offset from the containing actor

I am trying to use a spline to modify the navmesh. I came across the SplineNavModifier component and added it to a new actor in a brand new project. It seems the actual resulting modifier area (blue lines) is offset from the spline itself based on the containing actors world location. It also appears if I bring the actor too far from the world origin it no longer works at all. Is this component bugged or is there something I may be doing wrong?