delegation-only message

Tue Apr 6 20:58:35 UTC 2004

I am running the 9.2.2 version of named with the "delegation-only" patch.
I get quite a few errors logged like: 

enforced delegation-only for 'com' (ns1.swqj.com/A/IN) from 192.12.94.30#53      
I believe these are due to glue records remaining behind when a domain
is suspended (swqj.com, in this case), for the sake of other still active
domains which use that name server. 

My question is this: Is the delegation-only functionality flawed in that
it disallows perfectly valid situations, or is keeping the glue record
around an inappropriate action by the registrar of the suspended domain?