Unable to find GPU in pod where GPU has been successfully allocated, and nvidia-smi displays the message "Device not found" after execution.

I used the nvkind to build a k8s cluster with two worker nodes as the example showed in a linux server.
a work node with 2 gpus and the other with 3 nodes.
Then I ininstalled a gpu-operator and everything looked fine.
After that, I tried to apply a pod via kubectl apply command.
This pod needed a gpu resource and the status of this pod was running.
Finally, I tried to log this pod to see if everything was ok and find that the nvidia-smi displayed the message "Device not found" after execution.

1. The k8s cluster info:
   nvkind cluster print-gpus
   [
   {
   "node": "explicit-gpus-worker",
   "gpus": [
   {
   "Index": "0",
   "Name": "NVIDIA H20",
   "UUID": "GPU-3c10a6fd-a8c7-4e9a-0788-32b503a11514"
   },
   {
   "Index": "1",
   "Name": "NVIDIA H20",
   "UUID": "GPU-4fca9ef6-4ebf-f2ca-3d57-51b2dd23f146"
   }
   ]
   },
   {
   "node": "explicit-gpus-worker2",
   "gpus": [
   {
   "Index": "0",
   "Name": "NVIDIA H20",
   "UUID": "GPU-d7adcefb-078a-69d7-d3d1-3b853ce93225"
   },
   {
   "Index": "1",
   "Name": "NVIDIA H20",
   "UUID": "GPU-734f87a0-26b1-e9c7-501a-be3d8b85fb8e"
   },
   {
   "Index": "2",
   "Name": "NVIDIA H20",
   "UUID": "GPU-4917c52b-1af2-a05f-100f-d348f9cd7cf5"
   }
   ]
   }
   ]

2. kubectl get pods
   NAME READY STATUS RESTARTS AGE
   gpu-pod 1/1 Running 0 45s

3. kubectl logs gpu-pod
   No devices were found

4.gpu-pod yaml file
apiVersion: v1
kind: Pod
metadata:
name: gpu-pod
labels:
app: gpu-workload
spec:
nodeSelector:
accelerator: nvidia-tesla-k160 # Select nodes with GPU (adjust label as needed)
containers:
- name: gpu-container
image: nvidia/cuda:11.8.0-base-ubuntu22.04
command: ["bash", "-c"]
args: ["nvidia-smi; trap 'exit 0' TERM; sleep infinity & wait"]
resources:
requests:
nvidia.com/gpu: "1" # Request 1 GPU
limits:
nvidia.com/gpu: "1" # Limit to 1 GPU
restartPolicy: Never

Reproduce the report with the nvkind cluster, the gpu-operator, the supplied gpu-pod YAML, and the nvkind cluster print-gpus, kubectl get pods, and kubectl logs gpu-pod commands. Inspect the node selection, GPU resource allocation, and container output to identify why nvidia-smi reports no devices; done means the cause is confirmed and GPU visibility works in the pod or the limitation is documented.