Isn't it that the footprint should be straddle mounted and through hole?

Hi there,

Thanks for reaching out. Upon checking, this specific USB connector is indeed an edge-connected, straddle-mounted USB and also with 24 pins.

In the footprint viewer, it may only show that it only has 12 pins but if you open it in your design tool, the footprint has top and bottom layer pads which consists of 12 pins on top and 12 pins on the bottom.

To mount this USB, you need to have a 0.8mm PCB thickness, connect it on the edge and in between the USBs legs. Kindly check this image for example: https://www.globalsources.com/USB-C/USB-C-male-straddle-mount-type-1143401573p.htm

I hope this helps clear out the confusion. Please let us know if you have any other questions or clarifications.

Thanks!