Resource addresses in prior state of a json plan lacking indexes

[mwhooker]

Terraform Version

0.12.20

Terraform Configuration Files

resource "null_resource" "cluster" {
  count = 3
}

Expected Behavior

I expect there to be symmetry between prior state and proposed state. The proposed state looks like

{
  "format_version": "0.1",
  "terraform_version": "0.12.20",
  "planned_values": {
    "root_module": {
      "resources": [
        {
          "address": "null_resource.cluster[0]",
          "mode": "managed",
          "type": "null_resource",
          "name": "cluster",
          "index": 0,
          "provider_name": "null",
          "schema_version": 0,
          "values": {
            "triggers": null
          }
        },
...

Actual Behavior

The prior state, if I delete the resources, looks like

  "prior_state": {
    "format_version": "0.1",
    "terraform_version": "0.12.20",
    "values": {
      "root_module": {
        "resources": [
          {
            "address": "null_resource.cluster",
            "mode": "managed",
            "type": "null_resource",
            "name": "cluster",
            "index": 0,
            "provider_name": "null",
            "schema_version": 0,
            "values": {
              "id": "7039102915404397285",
              "triggers": null
            }
          },
...

Steps to Reproduce

1. Use example input
2. terraform init
3. terraform apply
4. delete resource
5. tf plan -out terraform.tfplan; tf show -json terraform.tfplan

Note that the resource addresses in the prior state do not contain an index.

[mildwonkey]

A note for future @mildwonkey :

The address string is an addrs.Resource in state but an addrs.AbsResourceInstance in the planned changes.

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