Not listening to 30303 on IPv6

[Jack-Works]

Description
Not listening to 30303 on IPv6

Steps to Reproduce
Start with --Network.LocalIp=::1

$ nc -zvw10 127.0.0.1 30303
Connection to 127.0.0.1 30303 port [tcp/*] succeeded!
$ nc -zvw10 ::1 30303
nc: connect to ::1 port 30303 (tcp) failed: Connection refused

Actual behavior
Not listening on IPv6 even explicitly specified

Expected behavior
Listen on IPv6 address.

Screenshots

Desktop (please complete the following information):
Please provide the following information regarding your setup:

• Operating System: Linux
• Version: 1.17.3+671d60ad
• Installation Method: GitHub Release
• Consensus Client: Not related

Additional context
I have a public IPv6 address but no IPv4. I want to be an IPv6 public peer.

Logs

[yorickdowne]

If I can add a wish list item here, I'd love v4/v6 dual-stack for P2P. Lighthouse for example does --listen-address '0.0.0.0' --listen-address '::' (or any combination thereof) and then P2P listens on both v4 and v6. The 0.0.0.0 is the default and then they're v4-only.

Erigon and Geth just do dual-stack by default, no additional parameters required. Same for Teku.