Another 2.2.23 oddity

[Mike Whitaker <mike@mindcandydesign.com>]

Expecting the answer 'upgrade' again, but thought I'd mention it:

We have a slightly odd schema, where basically  
cn=<USER>,ou=users,dn=foo has children,
cn=<THING>,cn=<USER>,ou=users,dn=foo

and a set of attr permissions, of which the key one is that  
cn=<USER>,ou=users,dn=foo can read/write to any children of it.

THIS works when bound as cn=a:

Oct  5 16:59:20 dev slapd[12626]: conn=7 op=17 ADD  
dn="cn=fullname,cn=a,ou=users,dc=foo"
Oct  5 16:59:20 dev slapd[12626]: conn=7 op=17 RESULT tag=105 err=0  
text=

THIS fails when bound as cn=a(b)

Oct  5 17:09:08 dev slapd[12626]: conn=9 op=6 ADD dn="cn=fulltext,cn=a 
(b),ou=users,dc=foo"
Oct  5 17:09:08 dev slapd[12626]: conn=9 op=6 RESULT tag=105 err=50  
text=no write access to entry

Reasonably exhaustive testing seems to suggest it's the brackets. Any  
thoughts?