I have noticed that there are some points around the camera (e.g. 0.014958163, 0.000104432824, 0.0011352401) that can be seen in the attached figure on the left side.
well, I saved your config file as debug.json in the ./exts/omni.isaac.sensor/data/lidar_configs/NVIDIA/debug.json folder so it would be in the lidar config search paths and could be used.
I then ran
./python.sh standalone_examples/api/omni.isaac.debug_draw/rtx_lidar.py debug
To take a look at it, and the config looks fine for a lidar with a short range.
I wonder, how you got the image above? That does not look like our debug viewer? Maybe you are drawing points that have 0 range or 0 intensity? Those points are not valid, and should be ignored.