I'm using this extension to create tabs from metaboxes:
https://github.com/stackadroit/cmb2-extensions

All working correct except when I try to add a group field, it doesn't respond, I tracked this down and found that when I use
'render_row_cb' => array( 'CMB2_Tabs', 'tabs_render_row_cb' ), on group field, it doesn't return anything to the function that is responsible for arranging the field into tabs which cause the group to be out of the wrapper and not within tabs.

so simple question, is there a way to return $field_args and $field from group field to the function, and I'll sort the rest.