unmarshaling unknown values is not supported with V2.6.0

[hatim-heffoudhi]

Hello,

We receive an error in our terraform plan after passing to v.2.6.0 , Its working with the v.2.5.0, is there any parameter or block missing here ?
Thank you for your help

Best regards,
Hatim & Amar

Terraform version: Terraform v1.0.3
Kubernetes provider version: v 2.6.0
Kubernetes version: v1.17

### Affected Resource(s)
<!-- Please list the resources as a list, for example:
- opc_instance
- opc_storage_volume
If this issue appears to affect multiple resources, it may be an issue with Terraform's core, so please mention this. -->

### Terraform Configuration Files
```hcl
module "eks" {
  source          = "terraform-aws-modules/eks/aws"
  cluster_name    = local.cluster_name
  cluster_version = var.cluster_version
  vpc_id          = module.vpc.id
  subnets         = module.vpc.subnet_private_ids
  tags            = local.tags

  worker_groups_launch_template = [
    {
      name                 = format(local.label_formatter, "worker")
      instance_type        = var.workers_instance_type
      asg_desired_capacity = var.asg_desired_capacity
      asg_max_size         = var.asg_max_size
      asg_min_size         = var.asg_min_size
      root_volume_type     = var.root_volume_type
      root_volume_size     = var.root_volume_size
    }
  ]
  map_users = var.map_users

  map_roles = concat(var.map_roles)

}

data "aws_eks_cluster" "cluster" {
  name = module.eks.cluster_id
}

data "aws_eks_cluster_auth" "cluster" {
  name = module.eks.cluster_id
}


/**
** Provider Kubernetes
**/
provider "kubernetes" {
  host                   = data.aws_eks_cluster.cluster.endpoint
  cluster_ca_certificate = base64decode(data.aws_eks_cluster.cluster.certificate_authority.0.data)
  exec {
    api_version = "client.authentication.k8s.io/v1alpha1"
    command     = "aws"
    args = [
      "eks",
      "get-token",
      "--cluster-name",
      data.aws_eks_cluster.cluster.name
    ]
  }
}

Debug Output

Panic Output

Steps to Reproduce

The error is in plan statement

1. terraform plan

Expected Behavior

What should have happened?
Creation of the EKS cluster

Actual Behavior

What actually happened?
Error on plan statement

Important Factoids

[alexsomesan]

This issue should be fixed by this change: #1465
Next patch release will include it.

[hatim-heffoudhi]

Thank you @alexsomesan 👍!

[alexsomesan]

@hatim-heffoudhi Can you confirm if this issue got fixed for you in v2.6.1?

[alexsomesan]

Please let us know if this is resolved or still an issue. Going to close since the proposed fix has been released.

[github-actions]

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