Regardless of whether this was intentional or not, if it’s causing compatibility grief for your app you should file a bug about. Please post your bug number, just for the record.
Share and Enjoy
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"
Thank you, Quinn!
I filed 28378416 in Radar and also opened up a DTS ticket.
Will update the thread with anything I find/hear.
Just a quick note, we are seeing this in macOS Sierra 10.12 (16A319) as well, El Cap omitted the IPv4 results when running with no non-link local IPv4 addresses but Sierra returns them.