Is OH running with the same user that you have used to view the permissions? If it’s running as a service, then maybe it’s running with different user, and therefore different permissions?
Yes, it was the wrong user - my fault…
I partly restored my openhabian install - but as user openhabian, not user openhab.
Now I just restarted openhab after deleting the /zwave folder and it was created with correct user and permissions: