I just spent all of yesterday making a 12x1 rotary switch, and there was a lot of mucking-about with connectors - I’m not an expert -. When I Imported the part I had a lot of trouble assigning the connectors - FZ keep crashing -, so I went back and keep tweaking the drawings in Inkscape. Somehow I must have hit the right spot because FZ started accepting it - do them in order of tabs with breadboard connectors first and connectors last -.
Try clicking on the connector in the Inkscape XML box, and then along the top press “Raise selection to top (Home)”.
I think in the breadboard view in Inkscape the connectors only need 1 node each, schematic needs 2 per connection, and pcb only needs 1, but everything in the XML table has to be ordered and with the correct title groupings.
All the info I used was at the bottom of this post
I’m not very good - I’ve only made 3 parts - but If you can’t work it out do you have a link to the file so I can look at it.