Expose Bitcoin Knots on IPv6

Hi guys, I’m running Umbrel Home with everything up-to-date behind a Fritz!BOX 5590 router with 8.02 operating system

I’ve successfully exposed Bitcoin Knots to Internet via IPv4 , natting internal port 9333 to external port 8333. I can also see some connections via Tor and l2P to my node

One more thing: I don’t understand how to expose to Internet Bitcoin Knots via IPv6: bitnodes.io fail the check

Is there any suggestion for the IPv6 connectivity?

Thanks a lot!