I do not think the locations have changed from Dulfy’s guide. I have found all but one of the objects at the stated locations.
However, my last dirt covered object is not spawning. I also have other items like broken planks and branches at those locations instead. I have used different characters, different days, and different servers, and expanded to looking across whole swathes of the map (all suggestions that have worked for other players) and still cannot find it.
This is all that is stopping me completing living story and would really appreciate someone taking a look at it.