The Select Slope node creates a visual artifact at the edges of my preview, but only on the left and right sides, not the top and bottom (for some reason). This will continue through my graph and alter the final result, so it’s not just the preview render.
It reproduces with a simple radial gradient and a select slope node. You can see the issue here on the edges:
For some real context and more info. It maybe only happens on the left/right because it only affects east/west slopes, not north/south slopes, as seen in this image:
(that’s the left edge of my preview)