Create a Network Load Balancer on Oracle Cloud Infrastructure with a Reserved IP using Terraform - oracle-cloud-infrastructure

Question

Using Terraform to set up a Network Load Balancer on Oracle Cloud Infrastructure, it works as expected if created with an ephemeral public IP, however one created using a reserved public IP does not respond. Here are the exact Terraform resourses used to create the load balancer:
resource "oci_core_public_ip" "ip" {
for_each = { for lb in var.load_balancers: lb.subnet => lb if ! lb.private
compartment_id = local.compartment_ocid
display_name = "${var.name}-public-ip"
lifetime = "RESERVED"
lifecycle {
prevent_destroy = true
}
}
resource "oci_network_load_balancer_network_load_balancer" "nlb" {
for_each = { for lb in var.load_balancers: lb.subnet => lb if lb.type == "network" }
compartment_id = local.compartment_ocid
display_name = "${var.name}-network-load-balancer"
subnet_id = oci_core_subnet.s[each.value.subnet].id
is_private = each.value.private
#reserved_ips {
# id = oci_core_public_ip.ip[each.value.subnet].id
#}
}
All of the other resources: security list rules, listeners, backend set and backends, etc, etc, are created such that the above works. If, however I uncomment the assignment of reserved_ips to the network load balancer then it does not work: no response from the load balancer's public IP. Everything is the same except those three lines being uncommented.
Between each test I tear down everything and recreate with Terraform. It always works with an ephemeral IP and never works with the reserved IP. Why? What am I missing? Or does this just not work as advertised?
The Terraform version is v1.3.4 and the resource version is oracle/oci version 4.98.0.

Answer 1

The reserved IP is set up correctly however the terraform provider removes its association with the load balancer's private IP. Closer inspection of the Terraform output shows this
~ resource "oci_core_public_ip" "ip" {
id = "ocid1.publicip.oc1.uk-london-1.ama...sta"
- private_ip_id = "ocid1.privateip.oc1.uk-london-1.abw...kya" -> null
# (11 unchanged attributes hidden)
}
Manually replacing it fixes it (until the next tf run)
$ oci network public-ip update --public-ip-id ocid1.publicip.oc1.uk-london-1.ama...rrq --private-ip-id ocid1.privateip.oc1.uk-london-1.abw...kya
There is a bug ticket on Terraform's github.