Email handler shows field set titles despite all child fields are excluded

Changed the status to minor because the functionality seems to work as expected when using 'Custom body...' to construct the mail template, rather than the 'Twig template...'.

I'll continue investigating the Twig template. If I can't find a solution, or if using the custom body option proves sufficient, I'll close this issue as the functionality is working as designed.

I was wrong in my previous comment (#3), the expected result was not achieved in either way.

Checking if the child(ren) of a container should be excluded does the trick in my case. I hope someone can reproduce this problem and that these adjustments can fix it without other impact.

I can confirm that the current MR resolves the reported issue with nested fieldsets. It also applies when using other container elements "Container" and "Section".

If the nested container element however is a flexbox ("Flexbox layout") the original issue is still present.

Elements:

section_1:
  '#type': section
  '#title': Section_1
  flexbox_1:
    '#type': flexbox
    '#title': flex
    text_1:
      '#type': textfield
      '#title': text_1
    textarea_1:
      '#type': textarea
      '#title': textarea_1

Email:

e_mail:
    id: email
    handler_id: e_mail
    label: E-mail
    notes: ''
    status: true
    conditions: {  }
    weight: 0
    settings:
      states:
        - completed
      to_mail: some_email@test.com
      to_options: {  }
      bcc_mail: ''
      bcc_options: {  }
      cc_mail: ''
      cc_options: {  }
      from_mail: _default
      from_options: {  }
      from_name: _default
      reply_to: ''
      return_path: ''
      sender_mail: ''
      sender_name: ''
      subject: _default
      body: _default
      excluded_elements:
        text_1: text_1
        textarea_1: textarea_1
      ignore_access: false
      exclude_empty: true
      exclude_empty_checkbox: false
      exclude_attachments: false
      html: true
      attachments: false
      twig: false
      theme_name: ''
      parameters: {  }
      debug: false

Resulting email body

Submitted on man, 23 jun 2025 - 13:38

Submitted by: admin

Submitted values are:

Section_1