linkCards: no selection radiobuttons/tickboxes in version 3.3

Hi,
I’m trying to set up a custom workflow with the linkCards widget.

When I start the process and click on the widget, it shows properly the list class objects, however I can’t select them with a tickbox or checkbox.

Widget settings:
ButtonLabel=“AffectedCircuits”
ClassName=“Circuit”
Required=1
AllowCardEditing=1

I tested with an older version, it’s working fine.
Not working: 3.3
Working: 3.1-a

Please help, if this is a bug or a misconfiguration. But as I see the manual, it should work as I expect.

Thanks