Problems using smb

[Semptic]

I try to use hetzner storage box for storing some data. This only works without the usage of subDir like so:

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: storage-box
provisioner: smb.csi.k8s.io
parameters:
  source: "//<user>.your-storagebox.de/backup"
  csi.storage.k8s.io/node-stage-secret-name: "storage-box-credentials"
  csi.storage.k8s.io/node-stage-secret-namespace: "default"
reclaimPolicy: Delete  # available values: Delete, Retain
volumeBindingMode: Immediate
mountOptions:
  - dir_mode=0777
  - file_mode=0777
  - uid=1001
  - gid=1001
  - vers=3.0
  - noperm
  - mfsymlinks
  - cache=strict
  - noserverino

Although when I use explicit or implicit subDir it doesn't:

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: storage-box
provisioner: smb.csi.k8s.io
parameters:
  source: "//<user>.your-storagebox.de/backup"
  subDir: "${pvc.metadata.namespace}-${pvc.metadata.name}" 
  csi.storage.k8s.io/node-stage-secret-name: "storage-box-credentials"
  csi.storage.k8s.io/node-stage-secret-namespace: "default"
reclaimPolicy: Delete  # available values: Delete, Retain
volumeBindingMode: Immediate
mountOptions:
  - dir_mode=0777
  - file_mode=0777
  - uid=1001
  - gid=1001
  - vers=3.0
  - noperm
  - mfsymlinks
  - cache=strict
  - noserverino

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: storage-box
provisioner: smb.csi.k8s.io
parameters:
  source: "//<user>.your-storagebox.de/backup"
  # if csi.storage.k8s.io/provisioner-secret is provided, will create a sub directory
  # with PV name under source
  csi.storage.k8s.io/provisioner-secret-name: "storage-box-credentials"
  csi.storage.k8s.io/provisioner-secret-namespace: "default"
  csi.storage.k8s.io/node-stage-secret-name: "storage-box-credentials"
  csi.storage.k8s.io/node-stage-secret-namespace: "default"
reclaimPolicy: Delete  # available values: Delete, Retain
volumeBindingMode: Immediate
mountOptions:
  - dir_mode=0777
  - file_mode=0777
  - uid=1001
  - gid=1001
  - vers=3.0
  - noperm
  - mfsymlinks
  - cache=strict
  - noserverino

With either of those last two configs I'm getting an error like

rpc error: code = Internal desc = failed to mount smb server: rpc error: code = Internal desc = MkdirAll /tmp/pvc-001f3e32-12c1-4e62-bb9d-f61b928040c8 failed with error: mkdir /tmp/pvc-001f3e32-12c1-4e62-bb9d-f61b928040c8: read-only file system

Does anyone have an idea how I can solve this? I could do it with subPath on the container, but I would prefer if the pv would do this.