I'm encountering the same issue Originally posted by @mqmr in #2271, where I have GKE clusters configured with NAP that have been set to CGROUP_MODE_V2 by following the guide and running gcloud container clusters update CLUSTER_NAME --autoprovisioning-cgroup-mode=v2

This sets the linux_node_config for the NAP pools accordingly, but https://github.com/terraform-google-modules/terraform-google-kubernetes-engine/blob/main/modules/beta-private-cluster-update-variant/cluster.tf#L237-L244 does not include the config, and therefore terraform wants to remove it (which it fails to do on apply)

...
09:45:07.410 STDOUT terraform:   ~ update in-place
09:45:07.410 STDOUT terraform: Terraform will perform the following actions:
09:45:07.410 STDOUT terraform:   # module.beta-private-cluster[0].google_container_cluster.primary will be updated in-place
09:45:07.410 STDOUT terraform:   ~ resource "google_container_cluster" "primary" {
09:45:07.410 STDOUT terraform:         id                                       = "..."
09:45:07.410 STDOUT terraform:         name                                     = "..."
09:45:07.410 STDOUT terraform:         # (32 unchanged attributes hidden)
09:45:07.410 STDOUT terraform:       ~ node_pool_auto_config {
09:45:07.410 STDOUT terraform:             # (1 unchanged attribute hidden)
09:45:07.410 STDOUT terraform:           - linux_node_config {
09:45:07.410 STDOUT terraform:               - cgroup_mode = "CGROUP_MODE_V2" -> null
09:45:07.411 STDOUT terraform:             }
09:45:07.411 STDOUT terraform:             # (1 unchanged block hidden)
09:45:07.411 STDOUT terraform:         }
09:45:07.411 STDOUT terraform:         # (36 unchanged blocks hidden)
09:45:07.411 STDOUT terraform:     }
09:45:07.411 STDOUT terraform: Plan: 0 to add, 1 to change, 0 to destroy.
...
09:47:20.289 STDOUT terraform: module.beta-private-cluster[0].google_container_cluster.primary: Modifying... [id=...]
09:47:21.191 STDERR terraform: ╷
09:47:21.191 STDERR terraform: │ Error: googleapi: Error 400: Must specify a field to update.
09:47:21.191 STDERR terraform: │ Details:
09:47:21.191 STDERR terraform: │ [
09:47:21.191 STDERR terraform: │   {
09:47:21.191 STDERR terraform: │     "@type": "type.googleapis.com/google.rpc.RequestInfo",
09:47:21.191 STDERR terraform: │     "requestId": "0xe3c37cb1014465d6"
09:47:21.191 STDERR terraform: │   }
09:47:21.191 STDERR terraform: │ ]
09:47:21.191 STDERR terraform: │ , badRequest
...