"Script Restarts When Carried Over" still not entirely working

Attach this script to an FFC with "Script Restarts" and "Carry-Over":

ffc script One {
  void run(int data) {
    trace(data);
    while(true) {
      Waitframe();
      Screen->ComboD[90]=data;
    }
  }
}

The first FFC argument, "data", mysteriously changes to 0 when carried over. This doesn't happen if "Script Restarts" is unchecked.