Added/removed accessConfigs after inital instance creation do not get recognized

[tferazzi]

What happened?

Deploying an instance with a public IP initially and removing it afterwards does not get recognized by pulumi.

Example

Deploying an instance with a public IP like this:

new gcp.compute.Instance('my-instance-name', {
    name: 'my-instance-name',
    zone: 'europe-west4-a',
    machineType: 'f1-micro',
    networkInterfaces: [
      {
        subnetwork: args.subnetworkId,
        accessConfigs: [
          {
            networkTier: 'PREMIUM',
          },
        ],
      },
    ],
    bootDisk: {
      initializeParams: {
        image: 'ubuntu-2204-jammy-v20230727',
      },
    },
  });

And then removing the accessConfigs block like this:

new gcp.compute.Instance('my-instance-name', {
    name: 'my-instance-name',
    zone: 'europe-west4-a',
    machineType: 'f1-micro',
    networkInterfaces: [
      {
        subnetwork: args.subnetworkId,
        // accessConfigs: [
        //   {
        //     networkTier: 'PREMIUM',
        //   },
        // ],
      },
    ],
    bootDisk: {
      initializeParams: {
        image: 'ubuntu-2204-jammy-v20230727',
      },
    },
  });

And doing pulumi up again, results in no update/change of the instance.

Output of pulumi about

CLI
Version      3.88.0
Go Version   go1.21.2
Go Compiler  gc

Plugins
NAME    VERSION
nodejs  unknown

Host
OS       darwin
Version  13.6
Arch     arm64

Additional context

This also does not work the other way round:

1. Instance without public IP address
2. Add accessConfigs block to networkInterfaces
3. pulumi up -> results in no changes

Contributing

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[mikhailshilkov]

I can repro this issue locally, here is a full program:

import * as pulumi from "@pulumi/pulumi";
import * as gcp from "@pulumi/gcp";

new gcp.compute.Instance('my-instance-name', {
    name: 'my-instance-name',
    zone: 'europe-west4-a',
    machineType: 'f1-micro',
    networkInterfaces: [
      {
        network: "default",
        accessConfigs: [
          {
            networkTier: 'PREMIUM',
          },
        ],
      },
    ],
    bootDisk: {
      initializeParams: {
        image: 'ubuntu-2204-jammy-v20230727',
      },
    },
  });

cc @t0yv0 on another diff issue.