Schema Preview Not Working After Update

import { FiUser } from 'react-icons/fi'

import { createHeading, formatDate } from '../../helpers'

import SlugInput from 'sanity-plugin-better-slug'

import { isUniqueAcrossAllDocuments } from '../functions/isUniqueAcrossAllDocuments'

export default {
   name: 'author',
   title: 'Author',
   type: 'document',
   icon: FiUser,
   fields: [
      {
         name: 'name',
         title: 'Name',
         type: 'string'
      },
      {
         name: 'slug',
         title: 'Slug',
         type: 'slug',
         inputComponent: SlugInput,
         validation: (Rule) => Rule.required(),
         options: {
            source: 'name',
            maxLength: 100,
            basePath: '<http://localhost.com|localhost.com>',
            isUnique: isUniqueAcrossAllDocuments,
            slugify: (input) =>
               input.toLowerCase().replace(/\s+/g, '-').slice(0, 100)
         }
      },
      {
         title: 'Job title',
         name: 'jobTitle',
         type: 'string',
         validation: (Rule) =>
            Rule.required().error('This is required dear friend!'),
         options: {
            list: [
               // Others
               { title: 'Managing Partner', value: 'Managing Partner' },
               { title: 'Account Director', value: 'Account Director' },
               { title: 'Creative Director', value: 'Creative Director' },
               { title: 'Concepter', value: 'Concepter' },
               { title: 'Finance', value: 'Finance' },
               { title: 'Producer', value: 'Producer' },
               { title: 'Storyteller', value: 'Storyteller' },

               // Developers
               { title: 'Lead Developer', value: 'Lead Developer' },
               { title: 'Senior Developer', value: 'Senior Developer' },
               { title: 'Medior Developer', value: 'Medior Developer' },
               { title: 'Junior Developer', value: 'Junior Developer' },

               // Designers
               { title: 'Lead Designer', value: 'Lead Designer' },
               { title: 'Senior Designer', value: 'Senior Designer' },
               { title: 'Medior Designer', value: 'Medior Designer' },
               { title: 'Junior Designer', value: 'Junior Designer' },
               { title: 'Junior Creative', value: 'Junior Creative' }
            ]
         }
      },

      {
         name: 'bio',
         title: 'Bio',
         type: 'blockContent'
      },
      {
         name: 'authorImage',
         title: 'Author image',
         type: 'imageWithAltText'
      }
   ],

   preview: {
      select: {
         title: 'name',
         jobTitle: 'jobTitle',
         media: 'authorImage'
      },
      prepare(selection) {
         const { title, jobTitle } = selection

         return Object.assign({}, selection, {
            title: title,
            subtitle: jobTitle
         })
      }
   }
}

// First, we must import the schema creator
import createSchema from 'part:@sanity/base/schema-creator'

// Then import schema types from any plugins that might expose them
import schemaTypes from 'all:part:@sanity/base/schema-type'

const obj = {
	title: "Obj",
	name: "obj",
	type: "object",
	fields: [
		{
			title: "Plain text",
			name: "plain",
			type: "string"
		},
		{
			title: "Pick something",
			name: "pickSomething",
			type: "string",
			options: {
				list: [
					{ title: "Alpha", value: "a" },
					{ title: "Bravo", value: "b" },
					{ title: "Charlie", value: "c" },
					{ title: "Delta", value: "d" },
					{ title: "Echo", value: "e" },
					{ title: "Foxtrot", value: "f" },
				]
			}
		}
	],
	preview: {
		select: {
			title: "plain",
			subtitle: "pickSomething"
		}
	}
}

const doc = {
	title: "Doc",
	name: "doc",
	type: "document",
	fields: [
		{
			title: "Pickers",
			name: "pickers",
			type: "array",
			of: [{ type: "obj" }]
		}
	]
}

// Then we give our schema to the builder and provide the result to Sanity
export default createSchema({
  // We name our schema
  name: 'default',
  // Then proceed to concatenate our document type
  // to the ones provided by any plugins that are installed
  types: schemaTypes.concat([
    /* Your types here! */
    obj,
    doc
  ]),
})