Unbelievably, issue #13389 still isn't fixed. Back to string comparison...

main.tf

@@ -33,7 +33,7 @@ variable "enable_dns_support" {
 
 variable "enable_eks_support" {
   description = "When set to true, properly tags VPC assets with proper discovery assets"
-  default     = false
+  default     = "false"
 }
 
 variable "eks_cluster_name" {
@@ -45,7 +45,7 @@ resource "aws_vpc" "mod" {
   enable_dns_hostnames = "${var.enable_dns_hostnames}"
   enable_dns_support   = "${var.enable_dns_support}"
 
-  tags = "${zipmap(compact(split(",", var.enable_eks_support == false ? "Name" : "Name,kubernetes.io/cluster/${var.eks_cluster_name}")), compact(split(",", var.enable_eks_support == false ? "${var.name}" : "${var.name},shared")))}"
+  tags = "${zipmap(compact(split(",", var.enable_eks_support == "false" ? "Name" : "Name,kubernetes.io/cluster/${var.eks_cluster_name}")), compact(split(",", var.enable_eks_support == "false" ? "${var.name}" : "${var.name},shared")))}"
 }
 
 resource "aws_subnet" "public" {
@@ -74,7 +74,7 @@ resource "aws_subnet" "private" {
   availability_zone = "${element(var.availability_zones, count.index)}"
   count             = "${length(var.private_subnets)}"
 
-  tags = "${zipmap(compact(split(",", var.enable_eks_support == false ? "Name" : "Name,kubernetes.io/cluster/${var.eks_cluster_name}")), compact(split(",", var.enable_eks_support == false ? "${var.name}.private.${element(var.availability_zones, count.index)}" : "${var.name}.private.${element(var.availability_zones, count.index)},shared")))}"
+  tags = "${zipmap(compact(split(",", var.enable_eks_support == "false" ? "Name" : "Name,kubernetes.io/cluster/${var.eks_cluster_name}")), compact(split(",", var.enable_eks_support == "false" ? "${var.name}.private.${element(var.availability_zones, count.index)}" : "${var.name}.private.${element(var.availability_zones, count.index)},shared")))}"
 }
 
 resource "aws_internet_gateway" "mod" {