Deployment manager fails with a cryptic error - kubernetes

Question

So, I have a deployment manager configuration that is supposed to create a GKE cluster.
Here is the configuration:
resources:
- name: mycluster
type: container.v1.cluster
properties:
zone: us-central1-a
cluster:
name: mycluster
description: hello mycluster
masterAuth:
username: admin
password: password
loggingService: logging.googleapis.com
monitoringService: monitoring.googleapis.com
addonsConfig:
httpLoadBalancing:
disabled: false
horizontalPodAutoscaling:
disabled: false
nodePools:
-
name: default
initialNodeCount: 3
config:
machineType: n1-standard-1
diskSizeGb: 100
oauthScopes:
- https://www.googleapis.com/auth/compute
- https://www.googleapis.com/auth/devstorage.read_only
- https://www.googleapis.com/auth/logging.write
- https://www.googleapis.com/auth/monitoring
labels:
nodepool: default
autoscaling:
enabled: false
-
name: other
initialNodeCount: 2
config:
machineType: n1-standard-2
diskSizeGb: 100
oauthScopes:
- https://www.googleapis.com/auth/compute
- https://www.googleapis.com/auth/devstorage.read_only
- https://www.googleapis.com/auth/logging.write
- https://www.googleapis.com/auth/monitoring
labels:
nodepool: other
autoscaling:
enabled: false
locations:
- us-central1-a
- us-central1-b
- us-central1-c
When I run gcloud deployment-manager deployments create mydeployment --config config.yaml the deployment runs for a few minutes and fails with:
ERROR: (gcloud.deployment-manager.deployments.create) Error in Operation operation-xxxxxxxxxx-xxxxxxxxx-xxxxxxx-xxxxxxx:
errors:
- code: RESOURCE_ERROR
location: /deployments/mydeployment/resources/mycluster
message: 'Unexpected response from resource of type container.v1.cluster: 404 {"statusMessage":"Not
Found","requestPath":null}'
The cluster actually does get successfully created in GKE, and I can interact with it as normal. Deleting the failed deployment with gcloud deployment-manager deployments delete mydeployment deletes the deployment, but leaves the cluster hanging around.
What am I doing wrong here? I've tried other container.v1.cluster samples from around the web (such as https://github.com/mkarthikworld/caddy/tree/master/gke-caddy), they all fail for me with the same error.
Not sure where else to look.