[Bug 271661] NETLINK: static IPv6 configuration fails after base 4bf44dd73bc0

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271661

            Bug ID: 271661
           Summary: NETLINK: static IPv6 configuration fails after base
                    4bf44dd73bc0
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: throwaway_vthgwq4@protonmail.com

ifconfig_vtnet0_ipv6="inet6 2001:db8:2:2:0:ff48:42ff:161f/64"
ipv6_default_interface="vtnet0"
ipv6_defaultrouter="2001:db8:2:2::7"

in rc.conf(5) makes node unreachable after reboot and ssh login.

* FreeBSD-runtime package causes failure, no difference with full upgrade
* base f5abdb03119a with base 6d204407ec6e reverted fails
* base f5abdb03119a with base 6d204407ec6e and base 4bf44dd73bc0 reverted works
* node runs MINIMAL-based kernel and world both built without IPv4 support

Providing reproducer is tedious, would consider only if non-reproducible.

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