Don't worry too much. Before you added the sidewalks there was nothing you could have even routed on. Pedestrian navigation also isn't affected by this at all, this is about wheelchair and similiar routing only. 
So before your edits you couldn't route at all, now routing should work pretty well, this is just about the last steps to get it to perfect routing.
Maybe I worded it too drastic, my intend was mainly that you use a different way of mapping them on new crossings, since it is easier to do it in the flow than trying to fix it later.