I am most certainly NOT certain about this, though I have had some experience with county GIS, CPAD, State Parks and OSM (even the alignment of imagery) harmonizing together.  This really seems like some rough, estimated data by somebody, my guess is State Parks, as the data seem like they are "intended to follow the road..." (and/or something another, per some property deed metes and bounds somewhere...) but don't follow the road (as map data) as the actual road.  I could be wrong.

Again, "these tend to sort themselves out over time..." (years) and there is nothing wrong with talking about it (like we do here now) as that gets more eyes on it, and maybe somebody's eyes turn into their fingers touching a GIS trackpad / keyboard.  And then CPAD gets an update from State Parks and it's gets fixed in a CPAD revision, or something.  I've seen that.

It remains an "open note."  A number of fingers are pointing, a number of eyeballs are on it.  That's usually how this goes.