Error when applying a manifest with a key : {}

[gaurav517]

Terraform, Provider, Kubernetes versions

Terraform version:                                                                          
Terraform v1.0.3
on darwin_amd64

Provider version: 0.5.0

Kubernetes version:
Client Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.2", GitCommit:"092fbfbf53427de67cac1e9fa54aaa09a28371d7", GitTreeState:"clean", BuildDate:"2021-06-16T12:52:14Z", GoVersion:"go1.16.5", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"19+", GitVersion:"v1.19.9-gke.1900", GitCommit:"008fd38bf3dc201bebdd4fe26edf9bf87478309a", GitTreeState:"clean", BuildDate:"2021-04-14T09:22:08Z", GoVersion:"go1.15.8b5", Compiler:"gc", Platform:"linux/amd64"}

Terraform Configuration Files

resource "kubernetes_manifest" "cert_issuer_selfsigned" {
  provider   = "kubernetes-alpha"
  manifest   = {
    apiVersion = "cert-manager.io/v1"
    kind       = "ClusterIssuer"
    metadata   = {
      name = "selfsigned-cert-issuer"
    }
    spec       = {
      selfSigned = "{}"
    }
  }
}

Steps to Reproduce

terraform apply

Expected Behavior

kubernetes_manifest.cert_issuer_selfsigned should be applied.

Actual Behavior

Getting error:

│ Error: Failed to morph manifest to OAPI type
│ 
│   with kubernetes_manifest.cert_issuer_selfsigned,
│   on certs.tf line 29, in resource "kubernetes_manifest" "cert_issuer_selfsigned":
│   29: resource "kubernetes_manifest" "cert_issuer_selfsigned" {
│ 
│ AttributeName("spec"): [AttributeName("spec")] failed to morph object element into object element:
│ AttributeName("spec").AttributeName("selfSigned"): [AttributeName("spec").AttributeName("selfSigned")] failed to morph object element into object
│ element: AttributeName("spec").AttributeName("selfSigned"): [AttributeName("spec").AttributeName("selfSigned")] unsupported morph of string value
│ into type: tftypes.Object["crlDistributionPoints":tftypes.List[tftypes.String]]
╵

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