Reproducing Terraform GH Issue #5290

terraform.log

$ terraform plan
Refreshing Terraform state prior to plan...


The Terraform execution plan has been generated and is shown below.
Resources are shown in alphabetical order for quick scanning. Green resources
will be created (or destroyed and then created if an existing resource
exists), yellow resources are being changed in-place, and red resources
will be destroyed.

Note: You didn't specify an "-out" parameter to save this plan, so when
"apply" is called, Terraform can't guarantee this is what will execute.

+ aws_elb.deafult
    availability_zones.#:                   "" => "<computed>"
    connection_draining:                    "" => "0"
    connection_draining_timeout:            "" => "300"
    dns_name:                               "" => "<computed>"
    health_check.#:                         "" => "<computed>"
    idle_timeout:                           "" => "60"
    instances.#:                            "" => "<computed>"
    internal:                               "" => "<computed>"
    listener.#:                             "" => "1"
    listener.2305901286.instance_port:      "" => "12345"
    listener.2305901286.instance_protocol:  "" => "tcp"
    listener.2305901286.lb_port:            "" => "12345"
    listener.2305901286.lb_protocol:        "" => "tcp"
    listener.2305901286.ssl_certificate_id: "" => ""
    name:                                   "" => "<computed>"
    security_groups.#:                      "" => "<computed>"
    source_security_group:                  "" => "<computed>"
    source_security_group_id:               "" => "<computed>"
    subnets.#:                              "" => "<computed>"
    zone_id:                                "" => "<computed>"

+ aws_internet_gateway.sandbox
    vpc_id: "" => "${aws_vpc.default.id}"

+ aws_security_group.blue
    description: "" => "Managed by Terraform"
    egress.#:    "" => "<computed>"
    ingress.#:   "" => "<computed>"
    name:        "" => "<computed>"
    owner_id:    "" => "<computed>"
    vpc_id:      "" => "${aws_vpc.default.id}"

+ aws_subnet.default
    availability_zone:       "" => "us-east-1a"
    cidr_block:              "" => "192.168.0.0/20"
    map_public_ip_on_launch: "" => "0"
    vpc_id:                  "" => "${aws_vpc.default.id}"

+ aws_vpc.default
    cidr_block:                "" => "192.168.0.0/16"
    default_network_acl_id:    "" => "<computed>"
    default_security_group_id: "" => "<computed>"
    dhcp_options_id:           "" => "<computed>"
    enable_classiclink:        "" => "<computed>"
    enable_dns_hostnames:      "" => "<computed>"
    enable_dns_support:        "" => "<computed>"
    main_route_table_id:       "" => "<computed>"


Plan: 5 to add, 0 to change, 0 to destroy.

$ terraform apply
aws_vpc.default: Creating...
  cidr_block:                "" => "192.168.0.0/16"
  default_network_acl_id:    "" => "<computed>"
  default_security_group_id: "" => "<computed>"
  dhcp_options_id:           "" => "<computed>"
  enable_classiclink:        "" => "<computed>"
  enable_dns_hostnames:      "" => "<computed>"
  enable_dns_support:        "" => "<computed>"
  main_route_table_id:       "" => "<computed>"
aws_vpc.default: Creation complete
aws_subnet.default: Creating...
  availability_zone:       "" => "us-east-1a"
  cidr_block:              "" => "192.168.0.0/20"
  map_public_ip_on_launch: "" => "0"
  vpc_id:                  "" => "vpc-92bf9af6"
aws_internet_gateway.sandbox: Creating...
  vpc_id: "" => "vpc-92bf9af6"
aws_security_group.blue: Creating...
  description: "" => "Managed by Terraform"
  egress.#:    "" => "<computed>"
  ingress.#:   "" => "<computed>"
  name:        "" => "<computed>"
  owner_id:    "" => "<computed>"
  vpc_id:      "" => "vpc-92bf9af6"
aws_subnet.default: Creation complete
aws_internet_gateway.sandbox: Creation complete
aws_security_group.blue: Creation complete
aws_elb.deafult: Creating...
  availability_zones.#:                   "" => "<computed>"
  connection_draining:                    "" => "0"
  connection_draining_timeout:            "" => "300"
  dns_name:                               "" => "<computed>"
  health_check.#:                         "" => "<computed>"
  idle_timeout:                           "" => "60"
  instances.#:                            "" => "<computed>"
  internal:                               "" => "<computed>"
  listener.#:                             "" => "1"
  listener.2305901286.instance_port:      "" => "12345"
  listener.2305901286.instance_protocol:  "" => "tcp"
  listener.2305901286.lb_port:            "" => "12345"
  listener.2305901286.lb_protocol:        "" => "tcp"
  listener.2305901286.ssl_certificate_id: "" => ""
  name:                                   "" => "<computed>"
  security_groups.#:                      "" => "1"
  security_groups.2236446470:             "" => "sg-b90bd8c1"
  source_security_group:                  "" => "<computed>"
  source_security_group_id:               "" => "<computed>"
  subnets.#:                              "" => "1"
  subnets.1110652908:                     "" => "subnet-35a17d1f"
  zone_id:                                "" => "<computed>"
aws_elb.deafult: Creation complete

Apply complete! Resources: 5 added, 0 changed, 0 destroyed.

The state of your infrastructure has been saved to the path
below. This state is required to modify and destroy your
infrastructure, so keep it safe. To inspect the complete state
use the `terraform show` command.

State path: terraform.tfstate

$ perl -i -pe 's/security_groups/#security_groups/' main.tf

$ grep security_groups main.tf 
    #security_groups = ["${aws_security_group.blue.id}"]

$ terraform plan
Refreshing Terraform state prior to plan...

aws_vpc.default: Refreshing state... (ID: vpc-92bf9af6)
aws_security_group.blue: Refreshing state... (ID: sg-b90bd8c1)
aws_subnet.default: Refreshing state... (ID: subnet-35a17d1f)
aws_internet_gateway.sandbox: Refreshing state... (ID: igw-8a8423ee)
aws_elb.deafult: Refreshing state... (ID: tf-lb-cofhdjxd3vbhpbrdfxhnxo4dg4)

No changes. Infrastructure is up-to-date. This means that Terraform
could not detect any differences between your configuration and
the real physical resources that exist. As a result, Terraform
doesn't need to do anything.