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A screenshot that you have tested with "Try this API".

EDIT BY MAINTAINER (confirmed field masks work with try the API - used user's requests and specified addressComponents in the fields section on Try the API)

The field mask (X-Goog-FieldMask) is adhering to setting the fields returned by the functions, e.g. i didn't specify rating therefore it is 0.

However shouldn't the empty fields be not returned as part of the function call, e.g. searchNearby.

This requires manual intervention and processing to remove these unset fields.

A side question.. Where are the default values here set?

  const fieldMask = 'places.displayName,places.addressComponents';
    const request = {
      includedTypes: ['coffee_shop'],
      maxResultCount: 10,
      regionCode: 'GB',
      languageCode: 'en-GB',
      rankPreference: google.maps.places.v1.SearchNearbyRequest.RankPreference.POPULARITY,
      locationRestriction: {
        circle: {
          center: {
            latitude: 50.232671229974386,
            longitude: -3.765861197206113
          },
          radius: 1000.0
        }
      }
    };
    const callOptions = {
      //autoPaginate: false,
      otherArgs: {
        headers: {
          'X-Goog-FieldMask': fieldMask,
        },
      },
    };
  const [ resultArray, nextPageRequest, rawRespone ] = await this.#placesClient.searchNearby(request, callOptions);
  console.log('searchNearby', resultArray);

Output includes fields not specifically requested in the field mask:

  ...
  attributions: [],
  currentSecondaryOpeningHours: [],
  regularSecondaryOpeningHours: [],
  reviews: [],
  photos: [],
  subDestinations: [],
  containingPlaces: [],
  name: '',
  id: 'ChIJ9T5tCwXfbEgR8k2EaHtBkB',
  nationalPhoneNumber: '',
  internationalPhoneNumber: '',
  formattedAddress: '',
  plusCode: null,
  location: null,
  viewport: null,
  rating: 0,
  googleMapsUri: '',
  websiteUri: '',
  regularOpeningHours: null,
  adrFormatAddress: '',
  businessStatus: 'BUSINESS_STATUS_UNSPECIFIED',
  priceLevel: 'PRICE_LEVEL_UNSPECIFIED',
  iconMaskBaseUri: '',
  ...

Link to the code that reproduces this issue. A link to a public Github Repository or gist with a minimal reproduction.

https://gist.github.com/mstephens/d3224c292e4b242e2dee38bb3bf31864

A step-by-step description of how to reproduce the issue, based on the linked reproduction.

1. Run function searchNearby

A clear and concise description of what the bug is, and what you expected to happen.

Fields not specified in field mask, to not be returned

A clear and concise description WHY you expect this behavior, i.e., was it a recent change, there is documentation that points to this behavior, etc. **

In the same way in which the 'vanilla' https://places.googleapis.com/v1/places:searchNearby API operates