Noticed this while I was exploring Clamber Crag and Uplands Verge. A pig happened to walk in front of me and I got prompted by an interaction menu to select either the pig or the signpost.
When I selected the signpost the description listed the destination and seems to mention a location that does not appear to be accessible yet.
Have yet to come across this issue with any other signposts so I don't know how prevalent it is beyond this case.