Currently, it is possible to create a field group that will be rendered as SDC, but when the entity type that contains that field group needs to be rendered as a component, it is not possible to map the field group.
That could be really useful for atomic design, where the title of a card can contain the author's picture, title, and a date.
The SDCs:
Card Header SDC
Card SDC
In the Drupal manage display, you will need to create a field group rendered as Card Header SDC and map the values, and then render the node as Card SDC.
I reproduced the error using the umami profile which already has at least 2 SDC.
Make the field groups to appear in the mapping.
Active
1.0
Code