Not possible to have an upload to be optional, is it a bug?

import { CollectionConfig } from "payload/types";

const Test:CollectionConfig = {
  slug: 'tests',
  fields: [
      {
        name: 'metaCoverImage',
        label: 'Cover Image',
        type: 'upload',
        relationTo: 'media',
        required: true,
      },
      {
        name: 'metaCustomOgImage',
        label: 'Custom OG Image (front-end will fallback to cover image if not presented)',
        type: 'upload',
        relationTo: 'media',
      },
    ]
}

export default Test;