Question - MIB registration/deregistration

Hi
 
We use net-snmp, version 4.2.6, with SMUX protocol in our product and we are seeing an issue with SNMP MIB deregistration. When our application is started, it takes over the MIB registration ownership of 'system' subtree. After stopping our application, we notice that SNMP master agent loses information about 'system' subtree. 
 
I looked at the net-snmp code and to me it looks like SNMP master agent doesn't try to take over the MIB registration ownership of 'system' subtree, after SMUX peer is disconnected. It unregisters the subtree  during smux_peer_cleanup() and doesn't attempt to register the subtree again. 
 
I was wondering if there is a known open issue related to the problem that we are noticing. If so, was there a fix for the problem and in which release?
 
Any help is greatly appreciated. 
 
Thanks
 
-- Prasanna