Multizone google_container_cluster Kubernetes deployments

I have a google_container_cluster specified this way:

resource "google_container_cluster" "primary" {
  name = "gke-${terraform.workspace}-cluster"
  location = "${var.region}-a"

  node_locations = [

This successfully creates GKE nodes in all three regions, and it used to also deploy my applications to all three locations. I’ve upgraded to Terraform 1.0, and my kubernetes_deployments are only surfacing on region-a. How do I get them to show up in all three regions, like they used to?