aws_autoscaling_lifecycle_hook does not properly delete notification_metadata

[gurchik]

Terraform Version

terraform version
Terraform v1.0.8
on darwin_amd64
+ provider registry.terraform.io/hashicorp/aws v3.62.0

Terraform Configuration Files

resource "aws_autoscaling_lifecycle_hook" "test" {
  name                   = "redacted"
  autoscaling_group_name = "redacted"
  default_result         = "ABANDON" 
  heartbeat_timeout      = 300
  lifecycle_transition   = "autoscaling:EC2_INSTANCE_TERMINATING"
  notification_metadata = "foobar"
}

Debug Output

Crash Output

Expected Behavior

After applying a plan, then running another plan without changing any configuration files, should not show changes need to be updated on aws_autoscaling_lifecycle_hook.

Actual Behavior

The plan shows the notification_metadata needs to be changed to null even though the plan and apply should have done that.

Steps to Reproduce

1. terraform plan the above configuration
2. terraform apply
3. Delete the notification_metadata line
4. terraform plan
5. terraform apply

Terraform will perform the following actions:

  # aws_autoscaling_lifecycle_hook.test will be updated in-place
  ~ resource "aws_autoscaling_lifecycle_hook" "test" {
        id                     = "redacted"
        name                   = "redacted"
      - notification_metadata  = "foobar" -> null
        # (4 unchanged attributes hidden)
    }

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

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes

aws_autoscaling_lifecycle_hook.test: Modifying... [id=redacted]
aws_autoscaling_lifecycle_hook.test: Modifications complete after 1s [id=redacted]

Apply complete! Resources: 0 added, 1 changed, 0 destroyed.

Now run another plan. It will look identical to the above even though that shouldn't happen.

Additional Context

References

[Nabushika]

I'm hitting a similar problem, I believe it's because terraform doesn't actually change the notification_metadata, it stays what it was first created as

[Nabushika]

I think it may be the same for other attributes (at least name, haven't checked others)

[Nabushika]

I believe this is intended - see https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/autoscaling_group#:~:text=Terraform%20has%20two%20types%20of%20ways%20you%20can%20add%20lifecycle%20hooks

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