zfs discuss - Sep 2012 - Should clearing the share property on a clone unshare the origin?

I''ve noticed on a Solaris 11 system that when I clone a filesystem and 
change the share property:

#zfs clone -p -o atime=off filesystem at snapshot clone

#zfs set -c share=name=<old share> clone

#zfs set share=name=<new NFS share> clone

#zfs set sharenfs=on clone

The origin filesystem is no longer shared (the clone is successfully 
shared).  The share and sharenfs properties on the origin filesystem are 
unchanged.

I have to run zfs share on the origin filesystem to restore the share.

Feature or a bug??

-- 
Ian.