[Hitcher]

Zeroconf won´t find any NFS sources either.

NFS network browsing is broken on some servers, certainly FreeNAS and Unraid servers.

It's a FreeNAS/Unraid issue. Most other NFS servers can be browsed without a problem. The FreeNAS and Unraid servers may just need rpcbind to be compiled with the option --enable-rmtcalls.

If your NFS server cannot be browsed by Kodi then report the issue to your NFS server software maintainer(s) so that they can hopefully fix it. 

Now fixed on Unraid.

code:
Version 6.8.2 2020-01-26



Base distro:

rpcbind: version 1.2.5 (rebuilt with --enable-rmtcalls option)