Your version is not really exporting connector0terminal correctly. It looks right, but that is only because your connector0pin rect element is the same color, and completely overlaps the connector0terminal element. Here is an extract from the exported svg file. Delete/move/hide the connector0pin element, and the foot is gone again. Or change the fill color of the connector0terminal. It does not show up.
<rect width="2.16" gorn="0.1.11" xmlns="http://www.w3.org/2000/svg" height="3.1248" fill="#8C8C8C" id="connector0pin" x="2.52" y="20.6352"/>
<g width="2.16" gorn="0.1.12" xmlns="http://www.w3.org/2000/svg" height="2.16" fill="#8C8C8C" id="connector0terminal" x="2.52" y="21.6"/>I am doing my editing with an xml aware text editor. Which is the reason I like (and manually created) the transform attributes. It allows me to position a group with transform, then have nice clean multiples of 0.1 inch for all of the element coordinates. And for repeating patterns, I can simply copy/paste, then add a group wrapper around the second copy with an appropriate transform offset. Typically also with multiples of 0.1 inch offsets.
For the rest, the part is a work in progress. Other things are still expected to change. Reported the problem at the stage it was discovered in. I'm working around the problem by keeping the connector«n»terminal graphics separate from the element that controls the snap coordinates used by Fritzing. My working version has the connector«n»terminal elements set to invisible, and outside of the breadboard element. I was trying to collapse them into a single visible element. Which failed.