The contact owns a 2024 Ford F-350. The contact stated that after reversing into the driveway and parking the vehicle, the engine was turned off while the vehicle was in reverse(R). The contact exited the vehicle and entered the residence. Moments later, the vehicle erroneously rolled down the driveway downhill and collided with a building on the property. The contacted stated that the Automatic Return to Park (P) safety feature failed to engage, causing the incident. The vehicle was later driven to the local dealer for repairs. The manufacturer was not yet contacted. The failure mileage was 30,000.