Landscape Spline Marked NOT spatially loaded… is spatially loaded anyway.

I create rivers using landscape splines. It’s easy, quick and they look great (well, the forks look okay). This is a big map so I have teleporters to bop between sections. I climbed a hill and discovered this (it’s hard to see)

So I thought it was my problem (because I have a lot of rivers in this). But when I walk closer to it using PIE

I have checked and double checked and I am assured that Is Spatially Loaded is false. Yet it still appears to spatially load it! Here is the setting for the landscape spline:

It seems counterintuitive to have a checkbox that gets ignored.