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The "Default IP address for DNS records" setting should be used not only for DNS records set up for a new domain, but for DNS records altered when the "Change IP Address" function is used.
Right now, doing a "Change IP Address" will set the DNS records to the selected interface address, regardless of the "Default IP address for DNS records" setting.
This seems like a bug to me.
Sorry, false alarm. I realized that there is a per-domain "IP address for use in DNS records" that wasn't set for the domains in question. Activating that setting seems to put things right.
Never mind, thanks!