Similar things happen fairly frequently if you ask for directions in remote areas, Google maps just directs you on long unmaintained old but officially mapped "roads" on public land. You really need to follow the land management agencies official maps to know the appropriate routes. Some paper maps (ex. Benchmark Road Atlas) are pretty decent and I've found worthwhile to keep in the car for these situations.
Once you get below the level of "real road," maybe best defined as well-maintained gravel road, databases get sketchy. (And even paved roads can be seasonal but at least these tend to have gates when they're closed--not that you can really count on lack of gates to mean the route is safe.)
Once you get off the beaten track, you really want to tap into local knowledge if you can. Don't just trust Google or paper maps for that matter.
Yup, I remember when I was going to check out the 2017 eclipse in eastern Oregon I wasn't really paying attention to the paper map and we were in a truck anyways but google maps routed us on a much worse road than the other option which is shown on the USGS topo map and the Benchmark Atlas.
