CIFS Share gives me "reading failed - Stale file handle (500)"

[DST73]

Hi,
I have added a CIFS share to my FritzBox-NAS.
I can create backups but if try to restore them or want to see what backups are created i get



The whole setup you can see at :
https://forum.proxmox.com/threads/cant-use-nfs-share.53463/post-604357

I already restarted PVE and the whole PC but I still get that error.

Any ideas ?

Thank you!