cannot create static routes in the same route table as the vpc attachment propagation one

[gianluca-ac]

Description

i'm using the tgw module together with the vpc one.
I'm creating a. new tgw enabling default route tables association and default route table propagation.
I addd two static routes, the resulting tgw is created with two route tables, one has the vpc attachment propagation routes and the other has the static routes requested.
The intended configuration is to have both the vpc attachment propagated routes and the static routes in the same routing table (default or otherwise).
my tgw configuration is below:

resource "aws_eip" "apne1-nat" {
count = 2
}

module "apne1-vpc-1" {
source = "terraform-aws-modules/vpc/aws"

name = "apne1-vpc-1"
cidr = "10.0.0.0/16"

azs = ["ap-northeast-1a", "ap-northeast-1d"]
private_subnets = ["10.0.0.0/21", "10.0.8.0/21"]
public_subnets = ["10.0.96.0/21", "10.0.104.0/24"]

enable_nat_gateway = true
single_nat_gateway = false
reuse_nat_ips = true
external_nat_ip_ids = "${aws_eip.apne1-nat.*.id}"
create_igw = true
amazon_side_asn = var.apne1-asn
map_public_ip_on_launch = true

tags = { }
}

module "apne1-tgw-1" {
source = "terraform-aws-modules/transit-gateway/aws"
version = "2.10.0"

name = "apne1-tgw-1"
description = "apne1-tgw-1"

enable_auto_accept_shared_attachments = false
amazon_side_asn = var.apne1-asn #BGP ASN for Tokyo Transit GW
share_tgw = true
ram_allow_external_principals = true
ram_name = "apne1-tgw-1"
ram_principals = []
enable_dns_support = true
enable_multicast_support = true
enable_default_route_table_association = true
enable_default_route_table_propagation = true
transit_gateway_cidr_blocks = ["10.0.255.0/24"]

vpc_attachments = {
vpc = {
vpc_id = module.apne1-vpc-1.vpc_id
subnet_ids = module.apne1-vpc-1.private_subnets
dns_support = true
ipv6_support = false

  tgw_routes = [
    {
      destination_cidr_block = "10.10.0.0/16"
    },
    {
      destination_cidr_block = "10.20.0.0/16"
    }
  ]
}

}

tags = {
Name = "apne1-tgw-1"
}
}

Versions

• Module version [Required]:
  2.1.0

• Terraform version:
  terraform cloud v. 1.5.4

• Provider version(s):

resource "aws_eip" "apne1-nat" {
count = 2
}

module "apne1-vpc-1" {
source = "terraform-aws-modules/vpc/aws"

name = "apne1-vpc-1"
cidr = "10.0.0.0/16"

azs = ["ap-northeast-1a", "ap-northeast-1d"]
private_subnets = ["10.0.0.0/21", "10.0.8.0/21"]
public_subnets = ["10.0.96.0/21", "10.0.104.0/24"]

enable_nat_gateway = true
single_nat_gateway = false
reuse_nat_ips = true
external_nat_ip_ids = "${aws_eip.apne1-nat.*.id}"
create_igw = true
amazon_side_asn = var.apne1-asn
map_public_ip_on_launch = true

tags = { }
}

module "apne1-tgw-1" {
source = "terraform-aws-modules/transit-gateway/aws"
version = "2.10.0"

name = "apne1-tgw-1"
description = "apne1-tgw-1"

enable_auto_accept_shared_attachments = false
amazon_side_asn = var.apne1-asn #BGP ASN for Tokyo Transit GW
share_tgw = true
ram_allow_external_principals = true
ram_name = "apne1-tgw-1"
ram_principals = []
enable_dns_support = true
enable_multicast_support = true
enable_default_route_table_association = true
enable_default_route_table_propagation = true
transit_gateway_cidr_blocks = ["10.0.255.0/24"]

vpc_attachments = {
vpc = {
vpc_id = module.apne1-vpc-1.vpc_id
subnet_ids = module.apne1-vpc-1.private_subnets
dns_support = true
ipv6_support = false

  tgw_routes = [
    {
      destination_cidr_block = "10.10.0.0/16"
    },
    {
      destination_cidr_block = "10.20.0.0/16"
    }
  ]
}

}

tags = {
Name = "apne1-tgw-1"
}
}

Steps to reproduce the behavior:

yes yes i just commit and push the code and then let terraform cloud apply it

Expected behavior

one tgw, one route tables, propagated routes + static routes

Actual behavior

one tgw, two routing tables, one has the propagated routes from the vpc attachments, the other has two static routes

Terminal Output Screenshot(s)

Additional context

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