Dialogs that contains a multivalue field is not displaying correctly the Multivalue field values if nodes are not correlative. It is not detected that there is a missing node and it is displayed in the dialog as an empty entry.

Steps to reproduce

1. create a new dialog definition (see dialog definition attach)
2. Open the dialog and include for entries using the multi value field.
3. Go to JCR Browser and delete one of them in the middle
4. Open the dialog again to see the current data

Expected result

Just the existing nodes are displayed

Current result

The deleted node is displayed in the dialog with missing values. The last node with content is not displayed.

Workaround

There is a groovy script that is fixing this nodes, this script has been created by the partner (Big Thanks!)

Dev notes

In Magnolia 5.7 this issue didn't happen, the deleted node is ignored and not displayed.
If the entry is removed from the dialog itself, the nodes are renumbered in the correct order.

Same issue is happeningg on 6.2.3 with the new UI 6 definition

form:
  properties: 
    itemsLex:
      $type: jcrMultiField
      itemProvider:
        $type: jcrChildNodeProvider
        supportI18N: false
      entryResolution:
        class: info.magnolia.ui.editor.ByLexicographicallyIndexedChildNodes$Definition
      orderHandler:
        class: info.magnolia.ui.editor.LexicographicallyIndexedJcrNodeOrderHandler$Definition
      field:
        $type: compositeField
        properties:
          text:
            $type: textField
          link:
            $type: textField