Crossing node not added correctly

I figured out, in case the crossed highway is self-interacting, the duplicated node (a) gets the `highway=crossing` instead of a new crossing node (b) is added and tagged accordingly.

<img width="1078" height="777" alt="Image" src="https://github.com/user-attachments/assets/a93fa269-d24d-4a04-ac64-7c33254301da" />