Pulumi DeleteBeforeReplace not working

main.go

package main

import (
	"time"

	"github.com/pulumi/pulumi-gcp/sdk/go/gcp/compute"
	"github.com/pulumi/pulumi/sdk/go/pulumi"
)

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		const instancePrefix = "remove-me-when-upgrading"

		staticIP, err := compute.NewAddress(ctx, instancePrefix+"-ip", &compute.AddressArgs{})

		instanceConfig := &compute.InstanceArgs{
			MachineType: "f1-micro",
			BootDisk: map[string]interface{}{
				"initializeParams": map[string]string{
					"image": "ubuntu-os-cloud/ubuntu-minimal-1804-bionic-v20190403",
				},
			},
			MetadataStartupScript:  "echo " + time.Now().String(),
			AllowStoppingForUpdate: true,
			NetworkInterfaces: []interface{}{
				map[string]interface{}{
					"network": "default",
					"accessConfigs": []map[string]interface{}{
						map[string]interface{}{
							"natIp": staticIP.Address(),
						},
					},
				},
			},
		}

		_, err = compute.NewInstance(ctx, instancePrefix, instanceConfig, pulumi.ResourceOpt{
			DeleteBeforeReplace: true,
		})
		return err
	})
}