ISSUE BACK OF FRONT SEATS COLLAPSED BACKWARDS DURING A REAR END COLLISION. CAR TOTALED. On December 4. 2023 we were rear ended while stopped at red. The van that hit us was doing 40 MPH, when it hit the Tesla we were driving. The two front seat backs collapsed backwards. As the driver and because of the seat collapsing backwards I suffered a fractured BACK and have spent the last six plus months in a cervical thoracic brace which we are still in.