The problem here seems to be that the exports didn't have their own unique FSIDs. When I fixed that and restarted the nfs server, I got tewo entries in /proc/fs/nfsfs/volumes, one with FSC and one without.
I still think is a bug - if you try to mount two filesystems, one with fsc and one without, but both have the same fsid, that should throw some error and refuse to mount.
The problem here seems to be that the exports didn't have their own unique FSIDs. When I fixed that and restarted the nfs server, I got tewo entries in /proc/fs/ nfsfs/volumes, one with FSC and one without.
I still think is a bug - if you try to mount two filesystems, one with fsc and one without, but both have the same fsid, that should throw some error and refuse to mount.