Treasure map not showing barn finds

I bought the treasure map and it’s working, it shows all the XP and fast travel boards but none of the barn finds. Do I have to progress to some point for them to show up?

A follow-up… after you get your first legitimate barn find not the Volkswagen in the beginning that doesn’t really count but an actual barn find, which for me came after I unlocked one of the festivals. From that point the rest of the barn finds immediately populated on the map and now I can just fast travel and grab them.