The tool aways duplicates the last hop with IPv6 ICMP traceroute. For example:
1 - 2a06:a004:f078:10:aaa1:59ff:fe19:103f
2 - 2a06:a004:f078::1
3 - 2a06:f900:1:100::1
4 - 2001:7f8:20:101::208:93
5 -
6 - 2a02:6b8:0:1a00::fffe
7 - 2a02:6b8::473
8 - 2a02:6b8::473
9 - 2a02:6b8::473
10 - 2a02:6b8::473
11 - 2a02:6b8::473
12 - 2a02:6b8::473
13 - 2a02:6b8::473
14 - 2a02:6b8::473
15 - 2a02:6b8::473
16 - 2a02:6b8::473
17 - 2a02:6b8::473
18 - 2a02:6b8::473
19 - 2a02:6b8::473
20 - 2a02:6b8::473
21 - 2a02:6b8::473
22 - 2a02:6b8::473
23 - 2a02:6b8::473
24 - 2a02:6b8::473
25 - 2a02:6b8::473
26 - 2a02:6b8::473
27 - 2a02:6b8::473
28 - 2a02:6b8::473
29 - 2a02:6b8::473