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I believe I found the issue: I was editing/adding the routes inline when I created the route table. What tipped me off to the problem was this terraform link. <https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/route>

So I changed my code to this:
1. create the route table first
2. use aws.ec2.Route to add additional routes
```    egress_vpc_fw_public_subnet_rtb = aws.ec2.RouteTable(custom_tags['Name'],
        vpc_id=egress_vpc.id,

        tags=custom_tags,
        opts=ResourceOptions(depends_on=[tgw, egress_igw, egress_vpc]))


    route1 = aws.ec2.Route("route1",
    route_table_id=egress_vpc_fw_public_subnet_rtb.id,
    destination_cidr_block="0.0.0.0/0",
    gateway_id=egress_igw.id,
    opts=pulumi.ResourceOptions(depends_on=[egress_vpc_fw_public_subnet_rtb]))```