acs-commons-nested="NODE_STORE" not saving to nodes

AEM 6.3 with service pack 3. After upgrading our dialog won't save data as before. We access data entered for each slide added to the component by the 'iItems' Node it used to store in. The slides are now being stored in an array under the components properties instead.

Here is the dialog and example of how its being stored.

<pages
   jcr:primaryType="nt:unstructured"
   sling:resourceType="granite/ui/components/coral/foundation/form/multifield"
   class="full-width"
   fieldLabel="Carousel Slide Info">
  
  <field
   jcr:primaryType="nt:unstructured"
   sling:resourceType="granite/ui/components/foundation/form/fieldset"
   acs-commons-nested="NODE_STORE"
   name="./iItems">