Steps to reproduce

1.  Provide multi field definition inside block:

   1. categories:
        $type: compositeField
        itemProvider:
          $type: currentItemProvider
        properties:
          field:
            $type: jcrMultiField
            field:
              $type: linkField
              datasource:
                $type: jcrDatasource
                workspace: category

1.  Add a new story and block

Expected results

New block is added and works

Actual results

No block is added and there're no exception in log

Workaround

Development notes

propertyNameDecorator of ByIndexedChildNodes.Definition be expected to have default 

NoopNameDecorator.class but null is set. However, its value will present if getter method is used to get propertyNameDecorator