Group Field with save_field and disabled stores allways empty field

I created a option page with following group field:

$cmb_options->add_group_field( $group_field_id_receiver, array(
'name'       => esc_html__( 'Form ID', 'xyz' ),
'id'         => 'prefilled_receiver_form_id',
'type'       => 'text',
'desc'       => 'xxx',
'save_field' => false,
'attributes' => array(
    'readonly' => 'readonly',
    'disabled' => 'disabled',
),
) );

On every save the value will be empty. Even if there was a valid imput. Without disabeld it works…