Unity CSI Driver error question

Received following question

To sum it up, we need you to help us to fix the following error:
* ls: cannot access '/var/lib/kubelet/plugins/unity.emc.dell.com/csi_sock': No such file or directory
So provisioning new PVC is not a problem and works as expected but the wan't to know if this is a Bug or error that should be fixed.

During our last provision of storage via CSI Unity Driver we encountered the following error:
Please take a look at the following commands:
k get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
pvol1 Bound csivol-dev-it-7d480819bd 12Gi RWO unity-iscsi 9m55s
pvol2 Bound csivol-dev-it-bc9921b234 10Gi RWX unity-nfs 9m55s
k get pods
NAME READY STATUS RESTARTS AGE
unitytest-0 0/1 Pending 0 10m

CSI Unity Driver Node and Controller pods are working as expected...
k get pods -n unity
NAME READY STATUS RESTARTS AGE
unity-controller-77fd49d8c6-bjdb4 5/5 Running 7 20d
unity-controller-77fd49d8c6-fgxk2 5/5 Running 0 20d
unity-controller-77fd49d8c6-mrdgx 5/5 Running 0 20d
unity-node-6528n 2/2 Running 0 18m
unity-node-9t7b9 2/2 Running 6 60d
unity-node-bt2gw 2/2 Running 4 60d
but after troubleshooting logs we found the following error:
Endpoint unix:///var/lib/kubelet/plugins/unity.emc.dell.com/csi_sock
ls: cannot access '/var/lib/kubelet/plugins/unity.emc.dell.com/csi_sock': No such file or directory
time="2021-04-28T11:49:51Z" level=info runid=start msg="Driver Mode:node"
time="2021-04-28T11:49:51Z" level=info runid=start msg="X_CSI_UNITY_NODENAME:rzk8qaitw02"
time="2021-04-28T11:49:51Z" level=info runid=config-0 msg="*************Synchronizing driver config**************"
csi-unity logger initiated. This should be called only once.
time="2021-04-28T11:49:51Z" level=info msg="configured csi-unity.dellemc.com" ArrayId=c************** Insecure=false IsDefaultArray=true RestGateway="**************" password="*******" username=+++++++++
time="2021-04-28T11:49:51Z" level=info runid=node-0 msg="Starting goroutine to add Node information to storage array"
time="2021-04-28T11:49:51Z" level=info arrayid=c**************runid=config-1 msg="Dynamic config load goroutine invoked"
time="2021-04-28T11:49:51Z" level=info runid=config-0 msg="configured csi-unity.dellemc.com"
time="2021-04-28T11:49:51Z" level=info msg="identity service registered"
time="2021-04-28T11:49:51Z" level=info msg="node service registered"
time="2021-04-28T11:49:51Z" level=info msg=serving endpoint="unix:///var/lib/kubelet/plugins/unity.emc.dell.com/csi_sock"
time="2021-04-28T11:49:52Z" level=error arrayid=c************** runid=node-2 msg="Cannot read directory: /sys/class/fc_host Error: open /sys/class/fc_host: no such file or directory"
time="2021-04-28T11:49:52Z" level=info arrayid=c************** runid=node-2 msg="'FC Initiators' cannot be retrieved."
time="2021-04-28T11:49:52Z" level=info arrayid=c**************runid=node-2 msg="URI/api/instances/host/name:rzk8qaitw02?fields=id,name,description,fcHostInitiators,iscsiHostInitiators,hostIPPorts?fields"
time="2021-04-28T11:49:52Z" level=info arrayid=c************** runid=config-1 msg="Node initiators are synchronized with the Host Wwns on the array"
time="2021-04-28T11:49:54Z" level=info runid=1 msg="NodeGetInfo success"
time="2021-04-28T11:49:54Z" level=error runid=2 msg="Cannot read directory: /sys/class/fc_host Error: open /sys/class/fc_host: no such file or directory"
time="2021-04-28T11:49:54Z" level=info runid=2 msg="iSCSI/FC package found in this node proceeding to further validations"
time="2021-04-28T11:49:54Z" level=info arrayid=c************** runid=4 msg="URI/api/instances/host/name:rzk8qaitw02?fields=id,name,description,fcHostInitiators,iscsiHostInitiators,hostIPPorts?fields"
time="2021-04-28T11:49:54Z" level=info runid=2 msg="Got iSCSI Initiators, Checking health of initiators:[{HostInitiator_81}]"
time="2021-04-28T11:49:55Z" level=info runid=2 msg="iSCSI health is good for array:c**************, Health:ALRT_COMPONENT_OK"
time="2021-04-28T11:51:31Z" level=info runid=6 msg="Executing NodeGetCapabilities with args: {XXX_NoUnkeyedLiteral:{} XXX_unrecognized:[] XXX_sizecache:0}"
The CSI Socket file (/var/lib/kubelet/plugins/unity.emc.dell.com/csi_soc) does exist on the Nodes and gets mounted into the container (as an excerpt from docker inspect shows):
"Binds": [
"/var/lib/kubelet/plugins/unity.emc.dell.com:/var/lib/kubelet/plugins/unity.emc.dell.com",
"/var/lib/kubelet/plugins/kubernetes.io/csi:/var/lib/kubelet/plugins/kubernetes.io/csi:rshared",
"/var/lib/kubelet/pods:/var/lib/kubelet/pods:rshared",
"/dev:/dev",
"/:/noderoot",
"/var/lib/kubelet/pods/14807e17-afa3-448e-8162-99e074041833/volumes/kubernetes.io~projected/certs:/certs:ro",
"/var/lib/kubelet/pods/14807e17-afa3-448e-8162-99e074041833/volumes/kubernetes.io~secret/unity-config:/unity-config:ro",
"/var/lib/kubelet/pods/14807e17-afa3-448e-8162-99e074041833/volumes/kubernetes.io~secret/unity-node-token-fnvkc:/var/run/secrets/kubernetes.io/serviceaccount:ro",
"/var/lib/kubelet/pods/14807e17-afa3-448e-8162-99e074041833/etc-hosts:/etc/hosts",
"/var/lib/kubelet/pods/14807e17-afa3-448e-8162-99e074041833/containers/driver/4e01c69e:/dev/termination-log"
],
T