Cannot add media when creating a subgroup

Problem/Motivation

I cannot add media to the specific field when creating a subgroup

The following issue does not exist if you edit the subgroup (leave empty the field and then add the media when editing the subgroup)

Steps to reproduce

- Enable modules "Media" and "Media library"

- Create Group types "Parent" and "Child"

- Add relationship between groups "Parent" as parent and "Child" as child group

- On Group type "Child" add a field "Reference media" and select a media type (it doesn't matter which)

- Add a Group "Parent"

- Click to add a "Child" subgroup

- At the field to add a Media, click on "Add media" to open the popup of the media library

- Upload a file or use one existing media (if you added on your own beforehand)

- What should happen:
Go back to the form with the selected media inserted onto the field

- What happens:
Get error both on browser console and dblog with the following message

message: "An AJAX HTTP error occurred. HTTP Result Code: 403 Debugging information follows.
Path: /media-library?media_library_opener_id=media_library.opener.field_widget&media_library_allowed_types%5Baudio%5D=audio&media_library_allowed_types%5Bdocument%5D=document&media_library_selected_type=audio&media_library_remaining=1&media_library_opener_parameters%5Bfield_widget_id%5D=field_media&media_library_opener_parameters%5Bentity_type_id%5D=group&media_library_opener_parameters%5Bbundle%5D=child&media_library_opener_parameters%5Bfield_name%5D=field_media&hash=m84IYoJFRh2UN6t8_MZkzORvpingZFcuAg0SwiQYsN4&ajax_form=1&_wrapper_format=drupal_ajax. Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException: Cannot create a group globally if its group type is a non-root leaf of a tree. in Drupal\Core\Routing\AccessAwareRouter->checkAccess() (line 120 of /var/www/html/web/core/lib/Drupal/Core/Routing/AccessAwareRouter.php).

What is weird (for me) is that it throws this error message
Cannot create a group globally if its group type is a non-root leaf of a tree
where the actions I do, do not create a group, it's just adding a media to the field and then create the group, after filling in other fields

Do you have any idea?