If you change the Stepover to 0.125 it will complete the pocket and also on bigger dia. holes there was no nub in the center. Something about those dimensions I happened to pick.
Now take a look at the G-code generated and it will be in mm.
I would think the nub in the middle would be expected with the stepover being set at .2, anything over half the tool diameter would leave an uncut area.
On the Mac version the G Code saved correctly with a “G20” in the header.
I wouldn’t expect that with a pocket function. It should clear the pocket even with a step of tool diameter theoretically.
It seems to work correctly with other diameters with the same 0.2 stepover.