Steps to reproduce

1.  Create a component which has a Combobox field within a Switchable Field, e.g:

   label: Test
   
   form:
     properties:
       test1:
         $type: switchableField
         itemProvider:
           $type: jcrChildNodeProvider
         field:
           $type: comboBoxField
           defaultValue: false
           datasource:
             $type: optionListDatasource
             options:
               - name: false
                 value: false
                 label: no
               - name: true
                 value: true
                 label: yes

2.  Create the dialog and check the result

Expected results

Value false is pre-selected

Actual results

No value is selected

Workaround

N/A

Development notes

If the Combobox field is not nested within a Switchable field, the defaultValue property works and the false option is pre-selected when the dialog opens