Revit seems to be unable to ACCURATELY label property line arc segments. Honestly this is an embarrassment on a 50' arc I had nearly a difference of 6". I am not imagining things please look at this post it explains how you can retrieve the information from the drawing and accurately labels a Property Line arc segment. Surely one should not need to go to this amount of effort and still be prone to mistake. Could you please fix this. Here is the link I was referring to https://landarchbim.com/2014/10/03/property-lines-and-tagging-arcs/.