Comment 1 for bug 1588547

(1) From the screenshot you posted, it looks like the alias indeed has the IPv6 address, so the configuration that was rendered matches what is shown in the node interface configuration. (So I'm not sure what the bug is here?)

(2) I agree that the bond parameters on the alias interfaces is incorrect. Is this causing a problem, or is it just an annoyance? I would think that ifupdown would just ignore the extra parameters. This is generated by curtin, so I'll add curtin to this bug.

(3) When you create the bond, the MAC address is inherited from the first interface in the bond. Aliases in Linux always have the same MAC address as the parent interface. You can click the "MAC" column header (next to "Name") to double-check this.