Teardown and the per-peer diff built the list of IPv6 aliases to delete
from configuration alone, while adding an alias treated "already
exists" as success. An address the host already owned, ::1 on lo or its
own public /128, was therefore deleted when an inbound or peer that
named it went away.
The manager records the aliases whose add actually created them and
deletes only those; an address that was already there is left in place.
MHSanaei
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