wrong node_security_group_recommended_rules when VPC is dual stack and EKS is ipv4

[magzim21]

https://github.com/terraform-aws-modules/terraform-aws-eks/blob/master/node_groups.tf#L182

    egress_all = {
      description      = "Allow all egress"
      protocol         = "-1"
      from_port        = 0
      to_port          = 0
      type             = "egress"
      cidr_blocks      = ["0.0.0.0/0"]
      ipv6_cidr_blocks = var.cluster_ip_family == "ipv6" ? ["::/0"] : null        # Problem here
    }

ipv6_cidr_blocks = ["::/0"] should be at all times because it is safe and without it cluster BREAKs.
After long trobleshooting of my edge case when cluster was broken after I disabled VPC endpoints, systems within EKS preferred ipv6 during DNS resolution and timed out before fallback to ipv4.

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