That is exactly how it’s supposed to work.
The V-carving operation runs the V bit perfectly inside the shape. Look at the lettering:
The pocket operation also runs exactly to the border of a shape, so if you want the outer ramped edge of the V-carving operation to be removed, you’d have to offset the inner line by the the correct amount, which will depend on the angle of the V-bit and the depth limit of the V carve.
In your case, a 60 degree bit to 6mm deep would work out like this:
Half the V-bit angle is 30 degrees (because it’s one side of the bit).
Tan(30) = 0.57735 (close enough)
and 6mm x 0.57735 = 3.46 ish mm.
So the total amount you’d need to shift inward is 3.46mm.
Here’s the inner line of the diamond, offset inward by 3.46mm:
And here’s the bit, perfectly removing just the ramp after offsetting that line.
