Radio and Switch fields always reporting first choice value in Title Group

Hi,
following the instructions reported in
https://docs.metabox.io/extensions/meta-box-group/#collapsible-groups

the title group is usually working properly.

But the radio and the switch fields always report in the Group Title the first choice value ignoring the user selection

For example:

'group_title' => 'Static text {#} {radio_field}',

Using a select field does work properly,
but would be nice to have also the radio and switch fields options available

Thanks