Workflow wont update "stage field" bread crumb in potentials

Workflow wont update "stage field" bread crumb in potentials

I have set up work flows in potentials that keep the "stage" Field updated with out having to manually edit the record. However i have noticed using this method has stopped the bread crumb feature working? I am wondering why this is the case as the stage is clearly changing but the bread crumb just isn't recording the change?