occupied_cells_vis_array in rviz dissapear

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Hi,

I am using noetic ROS. I have a simulation scene with a crane moving and laser scanning the ground. Also I am using laser_assembler node to create pointcloud from LiDAR and octomap server where the cloud_in are the pointcloud generates by the laser_assembler node.

The ground is uneven. When I move the crane the ocuppied_cell_vis_array are generated according the uneven ground but after some second a lot of them dissapear.

Link to video https://www.youtube.com/watch?v=9oPKt...