The points are pretty far apart, so the automated check didn't detect it.
CA 178 never connected to Badwater Rd. It ends at the former national park boundary (the boundary has since moved a few miles east), with the coordinates from my handheld GPS receiver at the End CA 178 sign. However, usanp includes as part of Badwater Rd. the part of Jubilee Pass Rd. that fills in (imperfectly) the gap between Badwater and CA 178.
cl94 is now managing CA, so I'll let him make the fix.