Adding a second downstream DNS consumer requires restart

I'm in the process of moving from one downstream DNS server to a second, and as a transition aid I added the new one as a second member to the "ProvideTransfer" and "Notify" constructs in my "addns.xml" inside the "Outbound" stanza.

Initially I tried first to do "ods-enforcer zonelist export" (based on prior experience this is probably a good idea...), and then "ods-enforcer update all", but despite this, it was still not possible to do zone transfers from the new downstream DNS name server – the log still pointed to "acl failure".

After a full re-start of OpenDNSSEC, both downstream name servers can transfer the zones.  However, this is ... surprising and unexpected, and I wonder if it isn't in fact a (minor) bug.