What the layers mean
The dashed line is the nominal square pocket. The solid line is the contour after relief. That solid line is what SVG and DXF export. It is not the path of the cutter centre.
Sample files
100 × 70 mm pocket, 6.35 mm (1/4″) bit, all four corners on.
- dogbone-example.svg
- tbone-example.svg
- dogbone-test-panel.svg — 1/8″ bit, 50 × 30 mm
Background on why the corner needs a relief at all: CNC internal corner relief. Side-by-side choice: dogbone vs T-bone.