"Inconsistent final plan" minimal example output

Shell transcript

$ terraform apply 

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create
 <= read (data resources)

Terraform will perform the following actions:

  # module.peering_ca-central-1_us-east-1.data.aws_ec2_transit_gateway.dst will be read during apply
  # (config refers to values not yet known)
 <= data "aws_ec2_transit_gateway" "dst"  {
      + amazon_side_asn                    = (known after apply)
      + arn                                = (known after apply)
      + association_default_route_table_id = (known after apply)
      + auto_accept_shared_attachments     = (known after apply)
      + default_route_table_association    = (known after apply)
      + default_route_table_propagation    = (known after apply)
      + description                        = (known after apply)
      + dns_support                        = (known after apply)
      + id                                 = (known after apply)
      + owner_id                           = (known after apply)
      + propagation_default_route_table_id = (known after apply)
      + tags                               = (known after apply)
      + vpn_ecmp_support                   = (known after apply)
    }

  # module.peering_ca-central-1_us-east-1.data.aws_ec2_transit_gateway.src will be read during apply
  # (config refers to values not yet known)
 <= data "aws_ec2_transit_gateway" "src"  {
      + amazon_side_asn                    = (known after apply)
      + arn                                = (known after apply)
      + association_default_route_table_id = (known after apply)
      + auto_accept_shared_attachments     = (known after apply)
      + default_route_table_association    = (known after apply)
      + default_route_table_propagation    = (known after apply)
      + description                        = (known after apply)
      + dns_support                        = (known after apply)
      + id                                 = (known after apply)
      + owner_id                           = (known after apply)
      + propagation_default_route_table_id = (known after apply)
      + tags                               = (known after apply)
      + vpn_ecmp_support                   = (known after apply)
    }

  # module.peering_ca-central-1_us-east-1.data.aws_ec2_transit_gateway_route_table.dst will be read during apply
  # (config refers to values not yet known)
 <= data "aws_ec2_transit_gateway_route_table" "dst"  {
      + arn                             = (known after apply)
      + default_association_route_table = (known after apply)
      + default_propagation_route_table = (known after apply)
      + id                              = (known after apply)
      + tags                            = (known after apply)
      + transit_gateway_id              = (known after apply)

      + filter {
          + name   = "tag:Type"
          + values = [
              + "Peer",
            ]
        }
      + filter {
          + name   = "transit-gateway-id"
          + values = [
              + (known after apply),
            ]
        }
    }

  # module.peering_ca-central-1_us-east-1.data.aws_ec2_transit_gateway_route_table.src will be read during apply
  # (config refers to values not yet known)
 <= data "aws_ec2_transit_gateway_route_table" "src"  {
      + arn                             = (known after apply)
      + default_association_route_table = (known after apply)
      + default_propagation_route_table = (known after apply)
      + id                              = (known after apply)
      + tags                            = (known after apply)
      + transit_gateway_id              = (known after apply)

      + filter {
          + name   = "tag:Type"
          + values = [
              + "Peer",
            ]
        }
      + filter {
          + name   = "transit-gateway-id"
          + values = [
              + (known after apply),
            ]
        }
    }

  # module.peering_ca-central-1_us-east-1.data.aws_region.dst will be read during apply
  # (config refers to values not yet known)
 <= data "aws_region" "dst"  {
      + description = (known after apply)
      + endpoint    = (known after apply)
      + id          = (known after apply)
      + name        = (known after apply)
    }

  # module.peering_ca-central-1_us-east-1.data.aws_region.src will be read during apply
  # (config refers to values not yet known)
 <= data "aws_region" "src"  {
      + description = (known after apply)
      + endpoint    = (known after apply)
      + id          = (known after apply)
      + name        = (known after apply)
    }

  # module.peering_ca-central-1_us-east-1.aws_ec2_transit_gateway_peering_attachment.src will be created
  + resource "aws_ec2_transit_gateway_peering_attachment" "src" {
      + id                      = (known after apply)
      + peer_account_id         = (known after apply)
      + peer_region             = (known after apply)
      + peer_transit_gateway_id = (known after apply)
      + tags                    = (known after apply)
      + tags_all                = {
          + "Name" = "Default Name"
        }
      + transit_gateway_id      = (known after apply)
    }

  # module.tgw_dst.aws_ec2_transit_gateway.tgw will be created
  + resource "aws_ec2_transit_gateway" "tgw" {
      + amazon_side_asn                    = 64513
      + arn                                = (known after apply)
      + association_default_route_table_id = (known after apply)
      + auto_accept_shared_attachments     = "disable"
      + default_route_table_association    = "disable"
      + default_route_table_propagation    = "disable"
      + description                        = "TGW in us-east-1"
      + dns_support                        = "enable"
      + id                                 = (known after apply)
      + owner_id                           = (known after apply)
      + propagation_default_route_table_id = (known after apply)
      + tags_all                           = {
          + "Name" = "Default Name"
        }
      + vpn_ecmp_support                   = "enable"
    }

  # module.tgw_dst.aws_ec2_transit_gateway_route_table.peer will be created
  + resource "aws_ec2_transit_gateway_route_table" "peer" {
      + arn                             = (known after apply)
      + default_association_route_table = (known after apply)
      + default_propagation_route_table = (known after apply)
      + id                              = (known after apply)
      + tags                            = {
          + "Name" = "Peer TGW-RTB"
          + "Type" = "Peer"
        }
      + tags_all                        = {
          + "Name" = "Peer TGW-RTB"
          + "Type" = "Peer"
        }
      + transit_gateway_id              = (known after apply)
    }

  # module.tgw_src.aws_ec2_transit_gateway.tgw will be created
  + resource "aws_ec2_transit_gateway" "tgw" {
      + amazon_side_asn                    = 64512
      + arn                                = (known after apply)
      + association_default_route_table_id = (known after apply)
      + auto_accept_shared_attachments     = "disable"
      + default_route_table_association    = "disable"
      + default_route_table_propagation    = "disable"
      + description                        = "TGW in ca-central-1"
      + dns_support                        = "enable"
      + id                                 = (known after apply)
      + owner_id                           = (known after apply)
      + propagation_default_route_table_id = (known after apply)
      + tags_all                           = {
          + "Name" = "Default Name"
        }
      + vpn_ecmp_support                   = "enable"
    }

  # module.tgw_src.aws_ec2_transit_gateway_route_table.peer will be created
  + resource "aws_ec2_transit_gateway_route_table" "peer" {
      + arn                             = (known after apply)
      + default_association_route_table = (known after apply)
      + default_propagation_route_table = (known after apply)
      + id                              = (known after apply)
      + tags                            = {
          + "Name" = "Peer TGW-RTB"
          + "Type" = "Peer"
        }
      + tags_all                        = {
          + "Name" = "Peer TGW-RTB"
          + "Type" = "Peer"
        }
      + transit_gateway_id              = (known after apply)
    }

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

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes

module.tgw_src.aws_ec2_transit_gateway.tgw: Creating...
module.tgw_dst.aws_ec2_transit_gateway.tgw: Creating...
module.tgw_src.aws_ec2_transit_gateway.tgw: Still creating... [10s elapsed]
module.tgw_dst.aws_ec2_transit_gateway.tgw: Still creating... [10s elapsed]
module.tgw_src.aws_ec2_transit_gateway.tgw: Still creating... [20s elapsed]
module.tgw_dst.aws_ec2_transit_gateway.tgw: Still creating... [20s elapsed]
module.tgw_src.aws_ec2_transit_gateway.tgw: Still creating... [30s elapsed]
module.tgw_dst.aws_ec2_transit_gateway.tgw: Still creating... [30s elapsed]
module.tgw_src.aws_ec2_transit_gateway.tgw: Still creating... [40s elapsed]
module.tgw_dst.aws_ec2_transit_gateway.tgw: Still creating... [40s elapsed]
module.tgw_dst.aws_ec2_transit_gateway.tgw: Creation complete after 46s [id=tgw-09a98c0aaa223af91]
module.tgw_dst.aws_ec2_transit_gateway_route_table.peer: Creating...
module.tgw_src.aws_ec2_transit_gateway.tgw: Still creating... [50s elapsed]
module.tgw_src.aws_ec2_transit_gateway.tgw: Creation complete after 55s [id=tgw-05ad6aabdbb1b5928]
module.tgw_src.aws_ec2_transit_gateway_route_table.peer: Creating...
module.tgw_dst.aws_ec2_transit_gateway_route_table.peer: Still creating... [10s elapsed]
module.tgw_src.aws_ec2_transit_gateway_route_table.peer: Still creating... [10s elapsed]
module.tgw_dst.aws_ec2_transit_gateway_route_table.peer: Still creating... [20s elapsed]
module.tgw_src.aws_ec2_transit_gateway_route_table.peer: Creation complete after 14s [id=tgw-rtb-0b7458fa1acf912ac]
module.tgw_dst.aws_ec2_transit_gateway_route_table.peer: Still creating... [30s elapsed]
module.tgw_dst.aws_ec2_transit_gateway_route_table.peer: Still creating... [40s elapsed]
module.tgw_dst.aws_ec2_transit_gateway_route_table.peer: Still creating... [50s elapsed]
module.tgw_dst.aws_ec2_transit_gateway_route_table.peer: Creation complete after 56s [id=tgw-rtb-02068f2bdc2e83616]
module.peering_ca-central-1_us-east-1.data.aws_region.src: Reading...
module.peering_ca-central-1_us-east-1.data.aws_ec2_transit_gateway.dst: Reading...
module.peering_ca-central-1_us-east-1.data.aws_region.dst: Reading...
module.peering_ca-central-1_us-east-1.data.aws_ec2_transit_gateway.src: Reading...
module.peering_ca-central-1_us-east-1.data.aws_region.src: Read complete after 0s [id=ca-central-1]
module.peering_ca-central-1_us-east-1.data.aws_region.dst: Read complete after 0s [id=us-east-1]
module.peering_ca-central-1_us-east-1.data.aws_ec2_transit_gateway.src: Read complete after 0s [id=tgw-05ad6aabdbb1b5928]
module.peering_ca-central-1_us-east-1.data.aws_ec2_transit_gateway_route_table.src: Reading...
module.peering_ca-central-1_us-east-1.data.aws_ec2_transit_gateway.dst: Read complete after 0s [id=tgw-09a98c0aaa223af91]
module.peering_ca-central-1_us-east-1.data.aws_ec2_transit_gateway_route_table.dst: Reading...
module.peering_ca-central-1_us-east-1.data.aws_ec2_transit_gateway_route_table.src: Read complete after 0s [id=tgw-rtb-0b7458fa1acf912ac]
module.peering_ca-central-1_us-east-1.data.aws_ec2_transit_gateway_route_table.dst: Read complete after 0s [id=tgw-rtb-02068f2bdc2e83616]
╷
│ Error: Provider produced inconsistent final plan
│ 
│ When expanding the plan for module.peering_ca-central-1_us-east-1.aws_ec2_transit_gateway_peering_attachment.src to include new values learned so far during apply, provider
│ "registry.terraform.io/hashicorp/aws" produced an invalid new value for .tags_all["Name"]: was cty.StringVal("Default Name"), but now cty.StringVal("Override Name - 'after apply'
│ interpolation us-east-1").
│ 
│ This is a bug in the provider, which should be reported in the provider's own issue tracker.
╵