oci_core_route_table gets recreated even if there are no changes

[carlosmartinezmoller]

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Terraform Version and Provider Version

Terraform v1.7.5
on linux_amd64

• provider registry.terraform.io/oracle/oci v5.32.0

Affected Resource(s)

oci_core_route_table

Issue description

Each time that "terraform apply" is executed the route gets recreated even if there are no changes:
`
Terraform will perform the following actions:

  module.network.oci_core_route_table.route_tables["rt-public"] will be updated in-place
  ~ resource "oci_core_route_table" "route_tables" {
    id             = "ocid1.routetable.oc1.iad.aaaaaaaaz2te5mbglprlwm3xrpoozknl7bwtqmc7gikiejkj25rr3g34tzha"
    # (7 unchanged attributes hidden)

  - route_rules {
      - description       = "Route all the traffic to internet" -> null
      - destination       = "0.0.0.0/0" -> null
      - destination_type  = "CIDR_BLOCK" -> null
      - network_entity_id = "ocid1.internetgateway.oc1.iad.aaaaaaaaw6gyllyb3vyz2pfn2damgok44ypop66fnt5ey5zqf3ae5qmjxdvq" -> null
    }
  + route_rules {
      + cidr_block        = (known after apply)
      + description       = "Route all the traffic to internet"
      + destination       = "0.0.0.0/0"
      + destination_type  = "CIDR_BLOCK"
      + network_entity_id = "ocid1.internetgateway.oc1.iad.aaaaaaaaw6gyllyb3vyz2pfn2damgok44ypop66fnt5ey5zqf3ae5qmjxdvq"
      + route_type        = "STATIC"
    }
}

 Plan: 0 to add, 1 to change, 0 to destroy.

`

The issue is related to the "cidr_block" field which is supposed to be deprecated. I should only be informing "destination" which replaces "cidr_block"

The issue happens even if I define it or I don't.

Terraform Configuration Files

This is how I create my routes:

`
resource "oci_core_route_table" "route_tables" {

    for_each={ for route_table in var.route_tables: route_table.display_name => route_table }

    # Required
    compartment_id=var.network_compartment_id
    vcn_id=oci_core_vcn.vcn.id
    display_name=each.value.display_name

    dynamic "route_rules" {

            for_each = { for route_rule in each.value.route_rules: route_rule.name => route_rule }
            content {
                    destination_type                = route_rules.value.destination_type
                    destination                     = route_rules.value.destination
                    network_entity_id               = route_rules.value.network_entity_id
                    route_type                      = "STATIC"
                    description                     = route_rules.value.description
            }
    }

     }

`

Debug Output

Expected Behavior

In theory the apply action should say that everything is up-to-date and not generate any change.

References

I see a similar issue #1844 but related to the route_type field.

In my case I am not hitting this issue with the route_type field, but with the cidr_block one which is deprecated.