tcpdump during ping6 failure

% ping6 -c 3 www.netbsd.org
PING6(56=40+8+8 bytes) fd17:625c:f037:2:6b39:c50d:203:a7b --> 2a04:4e42:69::262
16 bytes from 2a04:4e42:69::262, icmp_seq=0 hlim=57 time=8.709 ms
16 bytes from 2a04:4e42:69::262, icmp_seq=1 hlim=57 time=8.716 ms
16 bytes from 2a04:4e42:69::262, icmp_seq=2 hlim=57 time=9.347 ms

--- dualstack.o.ssl.global.fastly.net ping6 statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 8.709/8.924/9.347/0.366 ms
lim@sirius:~% sudo tcpdump -i wm0 -s 0 -vvv -n icmp6
tcpdump: listening on wm0, link-type EN10MB (Ethernet), capture size 262144 bytes
01:17:50.145943 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::6091:46c9:731b:c857 > fe80::5054:ff:fe12:3500: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has fe80::5054:ff:fe12:3500
          source link-address option (1), length 8 (1): 08:00:27:91:48:7d
            0x0000:  0800 2791 487d
01:17:50.146509 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::5054:ff:fe12:3500 > fe80::6091:46c9:731b:c857: [icmp6 sum ok] ICMP6, neighbor advertisement, length 32, tgt is fe80::5054:ff:fe12:3500, Flags [router, solicited, override]
          destination link-address option (2), length 8 (1): 52:54:00:12:35:00
            0x0000:  5254 0012 3500
01:17:50.196178 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::5054:ff:fe12:3500 > fd17:625c:f037:2:6b39:c50d:203:a7b: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has fd17:625c:f037:2:6b39:c50d:203:a7b
          source link-address option (1), length 8 (1): 52:54:00:12:35:00
            0x0000:  5254 0012 3500
01:17:50.196694 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 24) fe80::6091:46c9:731b:c857 > fe80::5054:ff:fe12:3500: [icmp6 sum ok] ICMP6, neighbor advertisement, length 24, tgt is fd17:625c:f037:2:6b39:c50d:203:a7b, Flags [solicited]
01:17:55.218600 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 32) fe80::5054:ff:fe12:3500 > fe80::6091:46c9:731b:c857: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has fe80::6091:46c9:731b:c857
          source link-address option (1), length 8 (1): 52:54:00:12:35:00
            0x0000:  5254 0012 3500
01:17:55.219332 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 24) fe80::6091:46c9:731b:c857 > fe80::5054:ff:fe12:3500: [icmp6 sum ok] ICMP6, neighbor advertisement, length 24, tgt is fe80::6091:46c9:731b:c857, Flags [solicited]
^C
6 packets captured
6 packets received by filter
0 packets dropped by kernel