[Bug]: aws_ec2_transit_gateway_route_table_association resource is getting replaced

[shilp120]

Terraform Core Version

Terraform v1.3.7

AWS Provider Version

provider registry.terraform.io/hashicorp/aws v5.5.0

Affected Resource(s)

aws_ec2_transit_gateway_route_table_association seems to be recreated

Expected Behavior

aws_ec2_transit_gateway_route_table_association resource should not be getting replaced due to an optional attribute. But this is causing an existing association to be replaced.

Actual Behavior

  # aws_ec2_transit_gateway_route_table_association.this[0] must be replaced
-/+ resource "aws_ec2_transit_gateway_route_table_association" "this" {
      ~ id                             = "tgw-rtb-XXXX_tgw-attach-XXXX" -> (known after apply)
      + replace_existing_association   = false
      ~ resource_id                    = "XXXX" -> (known after apply)
      ~ resource_type                  = "direct-connect-gateway" -> (known after apply)
      ~ transit_gateway_attachment_id  = "tgw-attach-XXXX"-> (known after apply) # forces replacement
        # (1 unchanged attribute hidden)
    }

Relevant Error/Panic Output Snippet

No response

Terraform Configuration Files

data "aws_ec2_transit_gateway_dx_gateway_attachment" "this" {
  transit_gateway_id = aws_dx_gateway_association.this[0].associated_gateway_id
  dx_gateway_id      = aws_dx_gateway_association.this[0].dx_gateway_id
}

resource "aws_ec2_transit_gateway_route_table_association" "this" {
  count = var.create_tgw_dcg_association ? 1 : 0

  transit_gateway_attachment_id  = data.aws_ec2_transit_gateway_dx_gateway_attachment.this.id
  transit_gateway_route_table_id = aws_ec2_transit_gateway_route_table.this[var.tgw_dcg_association_table].id
}

Steps to Reproduce

After upgrading the aws provider version to v5.5.0, we get this error. This seems to be added in https://github.com/hashicorp/terraform-provider-aws/releases/tag/v5.2.0 for the Issue - #31452

Debug Output

No response

Panic Output

No response

Important Factoids

No response

References

No response

Would you like to implement a fix?

None

[github-actions]

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[github-actions]

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