How to correctly mount a Kubernetes secret with subdirectories with Windows containers

I'm trying to mount a Kubernetes secret as a volume into a Pod running a Windows container. I want the mounted secret to contain subdirectories. To do so, I'm using the items feature (see also this StackOverflow question):

...
  containers:
    ...
    volumeMounts:
    - mountPath: C:\Secrets
      name: secrets-volume
      readOnly: true
...
  volumes:
  - name: secrets-volume
    secret:
      items:
      - key: secret.txt
        path: Files/secret.txt
      secretName: fs-testsecret

When the container is created, the C:\Secrets directory looks like this:

C:\secrets>dir
 Volume in drive C has no label.
 Volume Serial Number is DAA6-0343

 Directory of C:\secrets

09/29/2021  12:26 PM    <DIR>          .
09/29/2021  12:26 PM    <DIR>          ..
09/29/2021  12:26 PM    <DIR>          ..2021_09_29_10_26_51.246293635
09/29/2021  12:26 PM    <SYMLINKD>     ..data [..2021_09_29_10_26_51.246293635]
09/29/2021  12:26 PM    <SYMLINK>      Files [..data\Files]
               1 File(s)              0 bytes
               4 Dir(s)  44,635,086,848 bytes free

This is not right, the Files entry was created as a file symbolic link, not as a directory symbolic link. Navigating to that directory does not work. (Navigating to the ..data\Files directory does work.)

C:\secrets>cd Files
The directory name is invalid.

C:\secrets>cd ..data\Files

C:\secrets\..data\Files>dir
 Volume in drive C has no label.
 Volume Serial Number is DAA6-0343

 Directory of C:\secrets\..data\Files

09/29/2021  12:26 PM    <DIR>          .
09/29/2021  12:26 PM    <DIR>          ..
09/29/2021  12:26 PM               582 secret.txt
               1 File(s)            582 bytes
               2 Dir(s)  44,633,931,776 bytes free

Am I doing something wrong or is this a bug in Kubernetes with Windows containers?

Here's a full repro sample:

1. Create the secret (assuming a directory secrets with a file secret.txt):

kubectl -n ... create secret generic fs-testsecret --from-file secrets

2. The Pod resource definition:

apiVersion: v1
kind: Pod
metadata:
  name: fs-testpod
spec:
  containers:
  - command:
    - powershell
    image: mcr.microsoft.com/windows/servercore:ltsc2019
    imagePullPolicy: IfNotPresent
    name: fs-testpod-container
    stdin: true
    tty: true
    volumeMounts:
    - mountPath: C:\Secrets
      name: secrets-volume
      readOnly: true
  nodeSelector:
    kubernetes.io/os: windows
    node.kubernetes.io/windows-build: 10.0.17763
  tolerations:
  - effect: NoSchedule
    key: kubernetes.io/os
    operator: Equal
    value: windows
  volumes:
  - name: secrets-volume
    secret:
      items:
      - key: secret.txt
        path: Files/secret.txt
      secretName: fs-testsecret