Tokens not passing from wizard page 2 to default field value on wizard page 4

For bug reports provide the YAML of a minimal form which demonstrates the bug, and please leave out extra fields.

Thanks cilifen here's a much slimmed down version of the form, with just three wizard pages.

your_details_page:
  '#type': wizard_page
  '#title': 'Your details'
  your_details_fieldset:
    '#type': fieldset
    '#title': 'Your details'
    '#title_display': before
    first_name:
      '#type': textfield
      '#title': 'First name'
      '#autocomplete': 'off'
      '#required': true
      '#required_error': 'Please enter your first name'
    last_name:
      '#type': textfield
      '#title': 'Last name'
      '#autocomplete': 'off'
      '#required': true
      '#required_error': 'Please enter your last name'
business_details_page:
  '#type': wizard_page
  '#title': 'Business details'
  business_details_fieldset:
    '#type': fieldset
    '#title': 'Business details'
    '#required': true
    business_name:
      '#type': textfield
      '#title': 'Business name'
      '#autocomplete': 'off'
      '#required': true
      '#required_error': 'Please enter the business name'
mg11_details:
  '#type': wizard_page
  '#title': 'Confirm details'
  mg11_details_fieldset:
    '#type': fieldset
    '#title': 'Confirm your details'
    '#title display': before
    mg11_your_full_name:
      '#type': textfield
      '#title': 'What is your full name? (first name and surname)'
      '#autocomplete': 'off'
      '#required_error': 'Please enter your first name and surname'
      '#default_value': '[webform_submission:values:first_name] [webform_submission:values:last_name]'
    mg_11name_of_business:
      '#type': textfield
      '#title': 'Name of business'
      '#autocomplete': 'off'
      '#default_value': '[webform_submission:values:business_name]'
actions:
  '#type': webform_actions
  '#title': 'Submit button(s)'
  '#wizard_prev__label': Back
  '#wizard_next__label': Next
  '#preview_prev__label': Back
  '#preview_next__label': Review

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