Discussion about issues with querying the "contacts" field in a Sanity.io document.

{
      name: 'contacts',
      title: 'Contacts',
      type: 'array',
      of: [
        { type: 'contact_person' }
      ]
    }

...
type: "array",
of: [{ type: "reference", to: { type: "contact_person" } }],

export default {
  name: 'contact_person',
  type: 'object',
  title: 'Contact person',
  fields: [
    {
      name: 'name',
      title: 'Name',
      type: 'string'
    },
    {
      name: 'email',
      title: 'Email',
      type: 'string'
    },
    {
      name: 'field',
      title: 'Field of expertise',
      type: 'string'
    }
  ]
};

export async function preload({ params, query }) {
    const noticeQuery = `*[_type == "notice"][0]`;
    const noticeProjection = `{
      ...,
      body[]{
        ...,
        children[]{
          ...,
          "asset": asset->
        }
      }
    }`;
    
    const notice = await client.fetch(noticeQuery + noticeProjection);

sanity deploy

const noticeQuery = `*[_type == "notice"][0]`;
    const noticeProjection = `{
      contacts,
      ...,
      body[]{
        ...,
        children[]{
          ...,
          "asset": asset->
        }
      }
    }`;