Missing field "mainEntity"

[BenWortley]

Describe the bug

When using the FAQ Schema, it doesn't add the field mainEntity.

https://search.google.com/test/rich-results/result?id=nAmfarb8NDvZUAnofVhIvw

  defineWebPage({
    '@type': 'FAQPage',
  }),
  defineQuestion({
    name: 'How long will it take for my alloy wheels to be repaired or refurbished?',
    acceptedAnswer: 'Usually 2-3 working days, including wheels that are collected.',
  })

Reproduction

Attached above

System / Nuxt Info

No response