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I think you have to override the marking and clearing parameters for each sensor.

base_scan: {sensor_frame: front_laser,
        data_type: LaserScan,
        topic: /scan,
        expected_update_rate: 0.4,
        observation_persistence: 0.0,
        marking: true,
        clearing: true,
        min_obstacle_height: -0.10,
        max_obstacle_height: 2.0,
        obstacle_range: 15.0,
        raytrace_range: 15.0}

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