Removing pubsub topic allowed persistence regions does not update topic

[steved]

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Terraform Version & Provider Version(s)

Terraform v1.9.8 on darwin_arm64

• provider registry.terraform.io/hashicorp/google v6.11.1
• provider registry.terraform.io/hashicorp/google-beta v6.11.1

Affected Resource(s)

google_pubsub_topic

Terraform Configuration

Before:

resource "google_pubsub_topic" "usage-metrics" {
  name = "topic-name"

  message_storage_policy {
    allowed_persistence_regions = ["us-central1"]
  }
}

After:

resource "google_pubsub_topic" "usage-metrics" {
  name = "topic-name"

  # message_storage_policy {
  #   allowed_persistence_regions = ["us-central1"]
  # }
}

Debug Output

https://gist.github.com/steved/27766f27e5dbaf9fb7031c59234d2725

Expected Behavior

Allowed persistence regions should be reset to the default (or recomputed).

Actual Behavior

No changes are noted.

Steps to reproduce

1. terraform apply

Important Factoids

No response

References

No response

b/380481222

[ggtisc]

Confirmed issue!

After removing the message_storage_policy block the configuration persists in the tfstate file