Simple: You can't make paths using shovel on dirt. And it doesn't make sense, since you can make farmland using grass AND dirt, so why shovel uses only grass block and not both of them? Simple, but irritating bug.
Edit: I didn't put this image here, someone put it for no reason. Motfa, why?

Edit2: Added image of imbecile who put this useless fricking picture. Don't tell me to delete picture of this guy, since i can't do it for no reason.