Regression in Sanity causing custom type preview issues

export default {
    name: 'portals',
    type: 'array',
    of: [{type: 'string'}],
    initialValue: ['vt', 'vtna', 'vb', 'rt', 'udt'],
    options: {
      list: [
        {title: 'Trucks', value: 'vt'},
        {title: 'Trucks North America', value: 'vtna'},
        {title: 'Buses', value: 'vb'},
        {title: 'R Trucks', value: 'rt'},
        {title: 'U Trucks', value: 'udt'},
      ]
    },
    validation: (Rule) => Rule.required(),
}

      {
        title: 'Portals',
        description: 'The portals in which this API should be available in',
        name: 'portals',
        type: 'portals',
      },

preview: {
    select: {
      title: 'apiName',
      portals: 'portals',
      id: '_id',
    },
    prepare({title, portals, id}) {
      console.log(portals);
      const subtitle = portals.join(", ").toUpperCase()
      const isDraft = id.substring(0,5) == 'draft' ? '👷' : '✅'
      return {
        title: title,
        subtitle: subtitle,
        media: <span style={{fontSize: '1rem'}}>{isDraft}</span>
      }
    }
  }