Program: 86734
Project: 86734
Buggy source:
@Override public void updateState(NetEntity state,long time){
  super.updateState(state,time);
  NetTank netTank=(NetTank)state;
  this.currentState=State.fromNetValue(netTank.state);
  this.orientation=(float)Math.toRadians(netTank.orientation);
  this.turretOrientation=(float)Math.toRadians(netTank.turretOrientation);
  this.turretFacing.set(1,0);
  Vector2f.Vector2fRotate(this.turretFacing,this.turretOrientation,this.turretFacing);
  this.facing.set(this.turretFacing);
  this.primaryWeaponState=Weapon.State.fromNet(netTank.primaryWeaponState);
  this.secondaryWeaponState=Weapon.State.fromNet(netTank.secondaryWeaponState);
  Vector2f center=new Vector2f(getPos());
  center.x+=WeaponConstants.TANK_AABB_WIDTH / 2f;
  center.y+=WeaponConstants.TANK_AABB_HEIGHT / 2f;
  this.vehicleOOB.update(orientation,center);
  if (netTank.operatorId > 0) {
    ClientPlayer clientPlayer=game.getPlayers().getPlayer(netTank.operatorId);
    if (clientPlayer != null) {
      setOperator(clientPlayer.getEntity());
    }
  }
 else {
    setOperator(null);
  }
  if (prevState != null && nextState != null) {
    if (prevState.posX != nextState.posX || prevState.posY != nextState.posY) {
      float distanceSq=(nextState.posX - previousTrackMark.x) * (nextState.posX - previousTrackMark.x) + (nextState.posY - previousTrackMark.y) * (nextState.posY - previousTrackMark.y);
      if (distanceSq > 12 * 12) {
        previousTrackMark.set(nextState.posX,nextState.posY);
        trackMarkOffset.set(10,-15);
        Vector2f.Vector2fRotate(trackMarkOffset,vehicleOOB.orientation,trackMarkOffset);
        Vector2f.Vector2fAdd(vehicleOOB.topLeft,trackMarkOffset,trackMarkOffset);
        this.effects.addTankTrackMark(getId(),this.trackMarkOffset,this.orientation);
        trackMarkOffset.set(10,15);
        Vector2f.Vector2fRotate(trackMarkOffset,vehicleOOB.orientation,trackMarkOffset);
        Vector2f.Vector2fAdd(vehicleOOB.bottomLeft,trackMarkOffset,trackMarkOffset);
        this.effects.addTankTrackMark(getId(),trackMarkOffset,this.orientation);
      }
    }
  }
}

Fixed version (ground truth):
@Override public void updateState(NetEntity state,long time){
  super.updateState(state,time);
  NetTank netTank=(NetTank)state;
  this.currentState=State.fromNetValue(netTank.state);
  this.orientation=(float)Math.toRadians(netTank.orientation);
  this.turretOrientation=(float)Math.toRadians(netTank.turretOrientation);
  this.turretFacing.set(1,0);
  Vector2f.Vector2fRotate(this.turretFacing,this.turretOrientation,this.turretFacing);
  this.facing.set(this.turretFacing);
  this.primaryWeaponState=Weapon.State.fromNet(netTank.primaryWeaponState);
  this.secondaryWeaponState=Weapon.State.fromNet(netTank.secondaryWeaponState);
  Vector2f center=new Vector2f(getPos());
  center.x+=WeaponConstants.TANK_AABB_WIDTH / 2f;
  center.y+=WeaponConstants.TANK_AABB_HEIGHT / 2f;
  this.vehicleOOB.update(orientation,center);
  if (netTank.operatorId != SeventhConstants.INVALID_PLAYER_ID) {
    ClientPlayer clientPlayer=game.getPlayers().getPlayer(netTank.operatorId);
    if (clientPlayer != null) {
      setOperator(clientPlayer.getEntity());
    }
  }
 else {
    setOperator(null);
  }
  if (prevState != null && nextState != null) {
    if (prevState.posX != nextState.posX || prevState.posY != nextState.posY) {
      float distanceSq=(nextState.posX - previousTrackMark.x) * (nextState.posX - previousTrackMark.x) + (nextState.posY - previousTrackMark.y) * (nextState.posY - previousTrackMark.y);
      if (distanceSq > 12 * 12) {
        previousTrackMark.set(nextState.posX,nextState.posY);
        trackMarkOffset.set(10,-15);
        Vector2f.Vector2fRotate(trackMarkOffset,vehicleOOB.orientation,trackMarkOffset);
        Vector2f.Vector2fAdd(vehicleOOB.topLeft,trackMarkOffset,trackMarkOffset);
        this.effects.addTankTrackMark(getId(),this.trackMarkOffset,this.orientation);
        trackMarkOffset.set(10,15);
        Vector2f.Vector2fRotate(trackMarkOffset,vehicleOOB.orientation,trackMarkOffset);
        Vector2f.Vector2fAdd(vehicleOOB.bottomLeft,trackMarkOffset,trackMarkOffset);
        this.effects.addTankTrackMark(getId(),trackMarkOffset,this.orientation);
      }
    }
  }
}