cannot use icmp with IPv6 from docker image

[solaristhesun]

Describe the bug

I cannot use icmp v6 from the gatus docker image. I think it must be a gatus problem. Docker issues are pretty much ruled out because I can do this:

root@syn5 /home/sts/docker/gatus # G_PID=$(docker inspect -f '{{.State.Pid}}' gatus)
root@syn5 /home/sts/docker/gatus # nsenter -t $G_PID -n ping -6 -c 4 2a02:c207:3019:1725::1
PING 2a02:c207:3019:1725::1 (2a02:c207:3019:1725::1) 56 data bytes
64 bytes from 2a02:c207:3019:1725::1: icmp_seq=1 ttl=59 time=1.71 ms
64 bytes from 2a02:c207:3019:1725::1: icmp_seq=2 ttl=59 time=0.856 ms
^C
--- 2a02:c207:3019:1725::1 ping statistics ---
3 packets transmitted, 2 received, 33.3333% packet loss, time 2015ms
rtt min/avg/max/mdev = 0.856/1.285/1.714/0.429 ms

What do you see?

Timestamp
2026-02-27 10:47:33
Response Time
0ms
Conditions
✗
[CONNECTED] (false) == true

What do you expect to see?

I expect a success status.

List the steps that must be taken to reproduce this issue

endpoints:
  - name: "ping6"
    group: "fin1"
    url: "icmp://[2a02:c207:3019:1725::1]"
    interval: 60s
    conditions:
      - "[CONNECTED] == true"
    alerts:
      - type: telegram

Version

twinproduction/gatus:latest

Additional information

It also works, if I use a tcp check using IPv6.