In my Honda 2020 Pilot, the driver's side headrest in the 3rd row will no longer stay upright. It simply stays flat and will not lock into place. As the headrest will not stay upright, the seat is unusable. If someone used that seat or if the headrest would fail while a person is sitting in that seat, it would cause an injury risk. It looks like their is evidence that Technical Information and Support may be aware of the issue as indicated in a document on the nhtsa website.