[Bug]: produced an unexpected new value

Is there an existing issue for this?

I have searched the existing issues

Provider Version

2.7.0

Terraform Version

1.14.6

Terraform Edition

Terraform Open Source (OSS)

Current Behavior

I added use_effective_fields = true on my imported cluster and then added electable_specs as well since I was confronted with REPLICATION_SPECS_REQUIRES_ELECTABLE_SPECS. The apply seems to succeed within mongo but then fails on the state/output side of things:

Error: Provider produced inconsistent result after apply
│
│ When applying changes to mongodbatlas_advanced_cluster.this, provider "provider["registry.terraform.io/mongodb/mongodbatlas"]" produced an unexpected new value: .replication_specs[0].region_configs[0].analytics_specs.disk_size_gb: was cty.NumberIntVal(2048),
│ but now null.
│
│ This is a bug in the provider, which should be reported in the provider's own issue tracker.

Terraform configuration to reproduce the issue

resource "mongodbatlas_advanced_cluster" "this" {
  project_id           = local.project_id
  name                 = local.cluster_name
  cluster_type         = "REPLICASET"
  use_effective_fields = true
  replication_specs = [
    {
      region_configs = [
        {
          provider_name = "AZURE"
          priority      = 7
          region_name   = "GERMANY_WEST_CENTRAL"
          analytics_specs = {
            disk_iops     = 7500
            disk_size_gb  = 2048
            instance_size = "M60"
            node_count    = 0
          }
          auto_scaling = {
            compute_enabled            = true
            compute_max_instance_size  = "M60"
            compute_min_instance_size  = "M50"
            compute_scale_down_enabled = true
            disk_gb_enabled            = true
          }
          electable_specs = {
            instance_size = "M50"
            node_count    = 3
          }
        }
      ]
    }
  ]
}

Steps To Reproduce

not sure, create above without effective fields and then add it, perhaps

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Thanks for opening this issue! Please make sure you've followed our guidelines when opening the issue. In short, to help us reproduce the issue we need:

Terraform configuration file used to reproduce the issue
Terraform log files from the run where the issue occurred
Terraform Atlas provider version used to reproduce the issue
Terraform version used to reproduce the issue
Confirmation if Terraform OSS, Terraform Cloud, or Terraform Enterprise deployment

The ticket CLOUDP-384558 was created for internal tracking.

Deleting the disk specs (that I took from the import) seems to fix this.

@black-snow

Hi @black-snow, thank you for providing these details.

I was able to reproduce the inconsistent result after apply error by creating the configuration you shared and then doing a follow-up apply that enables use_effective_fields.

I can also confirm that your workaround of removing analytics_specs.disk_size_gb successfully allows Terraform to reach an empty plan.

We have identified an inconsistent behavior in the upstream API that is causing this. We are looking into it and will get back to you here as soon as we have an update.

fix: Avoids inconsistent result error when Atlas omits specs of nodel…

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[Bug]: produced an unexpected new value #4238

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[Bug]: produced an unexpected new value #4238

Description

Is there an existing issue for this?

Provider Version

Terraform Version

Terraform Edition

Current Behavior

Terraform configuration to reproduce the issue

Steps To Reproduce

Logs

Code of Conduct

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github-actions commented on Feb 26, 2026

black-snow commented on Feb 26, 2026

AgustinBettati commented on Feb 27, 2026

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