I am drawing a board which will fit in an enclosure with batteries. The battery terminal tabs should come up through slots in the PCB, and solder to a pad around the slot perimeter.
I created a new connector in our parts library as a through-hole with the dimensions of the slot I need. The three choices for hole types are "round", "rectangle", and "slot". I want to use "slot", but you can see below that it has a really weird effect on the copper pour.
I don't want a rectangle, but it has a predictable effect on the copper pours. The ground plane on the bottom layer connects to the pad, and the top copper is pushed away beyond the region where solder mask will be removed.
The slot-type through-hole pushes the top copper layer out in a weird blown up and rotated version of the actual slot.
Why is this happening?