Webform Signature Pad not working inside details fieldset

Problem/Motivation

Hello,
The signature does not work when the field is inside a details fieldset.

Steps to reproduce

- Add a details fieldset
- Add in the details fieldset a signature field
- Try to sign

fieldset_signature:
  '#type': details
  '#title': Signature
  signature_dossier:
    '#type': signature
    '#title': 'Signature Dossier'
    '#uri_scheme': private
  actions:
    '#type': webform_actions
    '#title': 'Bouton(s) d''envoi'
    '#attributes':
      class:
        - text-center
    '#submit__label': 'Signer Dossier Candidature'
    '#update_hide': true