Kubernetes resource apiVersion issue

api_versions.sh

#!/usr/bin/env bash
set -euo pipefail

echo "creating a apps/v1 deployment"
echo

cat <<EOF | kubectl create -f -
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: nginx:1.7.9
          ports:
            - containerPort: 80
EOF

api_version_create=$(kubectl get deployment nginx-deployment --template='{{.apiVersion}}')

echo
echo "actual apiVersion created: $api_version_create"

$ kubectl get deployments.apps nginx-deployment --template='{{.apiVersion}}'
apps/v1

$ kubectl get deployments.extensions nginx-deployment --template='{{.apiVersion}}'
extensions/v1beta1