addGroup() after getField() is not rendered

[marcelo2605]

In the following example, the foo group is not rendered:

->addGroup('base')
    ->addPartial(Links::class)
        ->modifyField('items', ['min' => 0])
        ->getField('items')
            ->addText('eyebrow')
->endGroup()
->addGroup('foo')
->endGroup();