Split BREP Error in GH, works in Rhino

I am trying to use the “cutter” polysrf to split the extruded rectangle. The split fails in Grasshopper (joined or deconstructed) but if you bake the geometry, explode the extrusion into 4 individual surfaces, then split them with the same cutter, it succeeds.
Any idea why this doesn’t work in GH?

Fails in GH
image Works in Rhino
split_error.gh (350.8 KB)