BUG in terraform-provider-google_v4.12.0_x5 - PROVIDER_UNSPECIFIED - INVALID_ARGUMENT

provider.terraform-provider-google_v4.12.0_x5-google_container_cluster.network_policy.provider.log

---[ REQUEST ]---------------------------------------
POST /v1/projects/REDACTED/locations/europe-west3-a/clusters/REDACTED:setNetworkPolicy?alt=json&prettyPrint=false HTTP/1.1
Host: container.googleapis.com
User-Agent: google-api-go-client/0.5 Terraform/1.1.6 (+https://www.terraform.io) Terraform-Plugin-SDK/2.10.1 terraform-provider-google/dev
Content-Length: 69
Content-Type: application/json
X-Goog-Api-Client: gl-go/1.16.14 gdcl/20220122
Accept-Encoding: gzip

{
 "networkPolicy": {
  "enabled": true,
  "provider": "PROVIDER_UNSPECIFIED"
 }
}

-----------------------------------------------------: timestamp=2022-03-09T15:47:07.798+0200
2022-03-09T15:47:07.887+0200 [INFO]  provider.terraform-provider-google_v4.12.0_x5: 2022/03/09 15:47:07 [DEBUG] Google API Response Details:
---[ RESPONSE ]--------------------------------------
HTTP/2.0 400 Bad Request
Alt-Svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000,h3-Q050=":443"; ma=2592000,h3-Q046=":443"; ma=2592000,h3-Q043=":443"; ma=2592000,quic=":443"; ma=2592000; v="46,43"
Cache-Control: private
Content-Type: application/json; charset=UTF-8
Date: Wed, 09 Mar 2022 13:47:07 GMT
Server: ESF
Vary: Origin
Vary: X-Origin
Vary: Referer
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-Xss-Protection: 0

{
  "error": {
    "code": 400,
    "message": "Invalid network policy provider.",
    "errors": [
      {
        "message": "Invalid network policy provider.",
        "domain": "global",
        "reason": "badRequest"
      }
    ],
    "status": "INVALID_ARGUMENT"
  }
}