[CentOS] Bind DDNS updates

So according to the Bind arm, `rndc freeze zone ...` should drop the jrn file and
flush its deltas. I have tested this and it's not updating the master on my 5.6 box
with bind-9.3.6, it drops the jrn and discards the deltas after an unfreeze|thaw.
A service restart behaves as expected.

Anyone know what's up with that, is it fixable? I don't really have the time to update
to 9.7 if that's a possible fix.

Thanks,
jlc