olivierlambert No, in the code we only check for non-hidden files, and djingo checked that the directory was totally empty.

djingo

It seems the problem happens when the directory shared contains non-hidden files.
Can you try to add a NFS remote with encryption on an new empty directory, and let us know if it works?

This is not specified, but the encrypted remote must not contain encrypted and unencrypted file, as they may conflict.
We should add this information.