SyntheticsTest resource will always show diff of assertions with --refresh

[williamsbdev]

I'm going to preface this with the fact that I'm not sure if this is an issue in Pulumi or in Terraform and I'd appreciate some help in determining where I should seek help.

Every time we run a pulumi preview --refresh --stack name --diff, we will see that the assertions are being added. It feels like the --refresh option is not properly querying the API and representing the assertions when populating the state and doing the diff.

Steps to reproduce

new datadog.SyntheticsTest(
  'some-name',
  {
    assertions: [
      {
        operator: 'lessThan',
        type: 'responseTime',
        target: responseTime,
      },
      {
        operator: 'is',
        type: 'statusCode',
        target: 200,
      }
    ],
    locations: ['aws:us-west-1'],
    message: pagerdutyMessage,
    'some-name',
    optionsList: {
      tickEvery: 300,
      minFailureDuration: 300,
      minLocationFailed: 1,
      followRedirects: true,
    },
    request: {
      method: 'GET',
      url: 'http://example.com',
      timeout: 30,
    },
    tags: defaultTags,
    type: 'api',
    subtype: 'http',
    status: 'live',
  }
)

1. Given the resource above
2. It has been deployed and no local changes have been made
3. Run the command pulumi preview --refresh --stack name --diff
4. You should see an update like the following:

~ assertions: [
    + [0]: {
        + operator  : "lessThan"
        + target    : 2000
        + type      : "responseTime"
    }
    + [1]: {
        + operator  : "is"
        + target    : 200
        + type      : "statusCode"
    }
]

Expected: There should be no updates made to the SyntheticsTest resource. Actual: The assertions array always shows an update from an empty array to the array with our assertions.