blockage_diag does not work properly

[Ofurosuki]

Hi, I am trying to use the blockage_diag package to test how severely the node can detect blockages. However, when I launched the node, /diagnostics said "ERROR: LIDAR was both blocked", although it just subscribed unblocked normal point cloud from AWSIM.

environments:
AWSIM: v1.2.1
Autoware universe: awsim-stable
ubuntu: 22.04

In AWSIM, I set Lidar sensor parameters as follows.

the contents of launch file is

<launch>
  <arg name="input_topic_name" default="sensing/lidar/top/pointcloud_raw_ex"/>
  <arg name="output_topic_name" default="blockage_diag/pointcloud"/>

  <node pkg="pointcloud_preprocessor" exec="blockage_diag_node" name="blockage_diag">
    <remap from="input" to="$(var input_topic_name)"/>
    <remap from="output" to="$(var output_topic_name)"/>
  </node>
</launch>

ros2 launch pointcloud_preprocessor blockage_diag.launch.xml

/diagnostics

header:
  stamp:
    sec: 1726719883
    nanosec: 145069912
  frame_id: ''
status:
- level: "\x02"
  name: 'blockage_diag: /: blockage_validation'
  message: 'ERROR: LIDAR both blockage'
  hardware_id: blockage_diag
  values:
  - key: ground_blockage_ratio
    value: '0.997222'
  - key: ground_blockage_count
    value: '101'
  - key: ground_blockage_range_deg
    value: '[1.000000,360.000000]'
  - key: sky_blockage_ratio
    value: '0.997222'
  - key: sky_blockage_count
    value: '101'
  - key: sky_blockage_range_deg
    value: '[1.000000,360.000000]'

Many thanks for considering my request.