Patch upcoming - note - you should really revert that content/visible thing :)
Haven't fully tested and converted everything, but this is what it is in my config directory and how the yml file looks like:

swenteldoos-2:active_n9IKA3S-qgBtvCWyFMRfbQQmKacxaKdd7qjR8KpkuB8 swentel$ ls
dblog.settings.yml                                 menu.settings.yml                                  system.performance.yml
field_group.node.article.default.group_testing.yml search.settings.yml                                system.rss.yml
image.style.large.yml                              system.cron.yml                                    system.site.yml
image.style.medium.yml                             system.logging.yml                                 user.mail.yml
image.style.thumbnail.yml                          system.maintenance.yml                             user.settings.yml
bundle: article
children:
  - field_image
collapsed: false
collapsible: true
disabled: false
entity_type: node
format_settings:
  formatter: collapsible
  instance_settings:
    classes: 'group-testing field-group-fieldset '
    description: ''
  label: 'Ale zenne'
format_type: fieldset
group_name: group_testing
identifier: group_testing|node|article|default
label: 'Ale zenne'
mode: default
parent_name: ''
weight: '1'
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#1 1793688-1.patch22.03 KBswentel
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Issue summary: View changes
Status: Active » Fixed

Status: Fixed » Closed (fixed)

Automatically closed - issue fixed for 2 weeks with no activity.