# Error: Provider produced inconsistent result after apply: After applying!terraform!plan, the provider returned a value for "instance_type" that was not in the plan: "t2.micro" -> "t3.micro"

- **ID:** `terraform/provider-inconsistent-result-after-apply`
- **Domain:** terraform
- **Category:** runtime_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The provider modified a resource attribute during creation/update that Terraform did not expect, often due to AWS defaulting or auto-converting instance types (e.g., t2.micro to t3.micro in certain regions).

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| Terraform v1.5 | active | — | — |
| Terraform v1.6 | active | — | — |
| AWS Provider v5.0 | active | — | — |
| AWS Provider v4.67 | active | — | — |

## Workarounds

1. **Update the configuration to explicitly set the attribute to the value the provider expects. For example, change 'instance_type = "t2.micro"' to 'instance_type = "t3.micro"' in the resource block, then run 'terraform apply' again.** (85% success)
   ```
   Update the configuration to explicitly set the attribute to the value the provider expects. For example, change 'instance_type = "t2.micro"' to 'instance_type = "t3.micro"' in the resource block, then run 'terraform apply' again.
   ```
2. **If the attribute is not critical, use lifecycle.ignore_changes with caution. Add 'lifecycle { ignore_changes = [instance_type] }' to the resource, then run 'terraform apply' to accept the current state. Example: resource "aws_instance" "example" { ami = "ami-abc123" instance_type = "t2.micro" lifecycle { ignore_changes = [instance_type] } }** (70% success)
   ```
   If the attribute is not critical, use lifecycle.ignore_changes with caution. Add 'lifecycle { ignore_changes = [instance_type] }' to the resource, then run 'terraform apply' to accept the current state. Example: resource "aws_instance" "example" { ami = "ami-abc123" instance_type = "t2.micro" lifecycle { ignore_changes = [instance_type] } }
   ```

## Dead Ends

- **** — State files should not be manually edited; it can cause drift, corruption, and is not idempotent. Terraform will detect the edit and may error on next plan. (95% fail)
- **** — This prevents Terraform from detecting future changes to instance_type, masking the issue and allowing drift to go unnoticed. (60% fail)
- **** — Older providers may have the same issue or other bugs; it also prevents using new features and security fixes. (70% fail)