diff --git a/code/Extension/UserFormFieldEditorExtension.php b/code/Extension/UserFormFieldEditorExtension.php
index 682d6a9c..ee8bf4d8 100644
--- a/code/Extension/UserFormFieldEditorExtension.php
+++ b/code/Extension/UserFormFieldEditorExtension.php
@@ -3,6 +3,7 @@
 namespace SilverStripe\UserForms\Extension;
 
 use SilverStripe\Admin\AdminRootController;
+use SilverStripe\Dev\Deprecation;
 use SilverStripe\Forms\FieldList;
 use SilverStripe\Forms\GridField\GridFieldPaginator;
 use SilverStripe\Forms\Tab;
@@ -49,6 +50,10 @@ class UserFormFieldEditorExtension extends DataExtension
         'Fields'
     ];
 
+    private static $cascade_duplicates = [
+        'Fields'
+    ];
+
     /**
      * Adds the field editor to the page.
      *
@@ -235,38 +240,13 @@ public function onAfterUnpublish()
      * @param bool $doWrite
      * @param string $manyMany
      * @return DataObject
+     * @deprecated 5.3.0 Will be removed without equivalent functionality to replace it
      */
     public function onAfterDuplicate($oldPage, $doWrite, $manyMany)
     {
-        // List of EditableFieldGroups, where the key of the array is the ID of the old end group
-        $fieldGroups = [];
-        foreach ($oldPage->Fields() as $field) {
-            /** @var EditableFormField $newField */
-            $newField = $field->duplicate(false);
-            $newField->ParentID = $this->owner->ID;
-            $newField->ParentClass = $this->owner->ClassName;
-            $newField->Version = 0;
-            $newField->write();
-
-            // If we encounter a group start, record it for later use
-            if ($field instanceof EditableFieldGroup) {
-                $fieldGroups[$field->EndID] = $newField;
-            }
-
-            // If we encounter an end group, link it back to the group start
-            if ($field instanceof EditableFieldGroupEnd && isset($fieldGroups[$field->ID])) {
-                $groupStart = $fieldGroups[$field->ID];
-                $groupStart->EndID = $newField->ID;
-                $groupStart->write();
-            }
-
-            foreach ($field->DisplayRules() as $customRule) {
-                $newRule = $customRule->duplicate(false);
-                $newRule->ParentID = $newField->ID;
-                $newRule->Version = 0;
-                $newRule->write();
-            }
-        }
+        Deprecation::withNoReplacement(
+            fn() => Deprecation::notice('5.3.0', 'Will be removed without equivalent functionality to replace it')
+        );
     }
 
     /**
diff --git a/code/Model/EditableFormField.php b/code/Model/EditableFormField.php
index e9f3af4b..37f438ba 100755
--- a/code/Model/EditableFormField.php
+++ b/code/Model/EditableFormField.php
@@ -181,7 +181,9 @@ class EditableFormField extends DataObject
         'DisplayRules',
     ];
 
-    private static $cascade_duplicates = false;
+    private static $cascade_duplicates = [
+        'DisplayRules',
+    ];
 
     /**
      * This is protected rather that private so that it's unit testable
diff --git a/code/Model/EditableFormField/EditableMultipleOptionField.php b/code/Model/EditableFormField/EditableMultipleOptionField.php
index feb2a981..a8f76fb2 100644
--- a/code/Model/EditableFormField/EditableMultipleOptionField.php
+++ b/code/Model/EditableFormField/EditableMultipleOptionField.php
@@ -55,6 +55,10 @@ class EditableMultipleOptionField extends EditableFormField
         'Options',
     ];
 
+    private static $cascade_duplicates = [
+        'Options',
+    ];
+
     private static $table_name = 'EditableMultipleOptionField';
 
     /**
@@ -112,25 +116,6 @@ public function getCMSFields()
         return $fields;
     }
 
-    /**
-     * Duplicate a pages content. We need to make sure all the fields attached
-     * to that page go with it
-     * {@inheritDoc}
-     */
-    public function duplicate(bool $doWrite = true, array|null $relations = null): static
-    {
-        $clonedNode = parent::duplicate(true);
-
-        foreach ($this->Options() as $field) {
-            $newField = $field->duplicate(false);
-            $newField->ParentID = $clonedNode->ID;
-            $newField->Version = 0;
-            $newField->write();
-        }
-
-        return $clonedNode;
-    }
-
     /**
      * Return whether or not this field has addable options such as a
      * {@link EditableDropdown} or {@link EditableRadioField}
diff --git a/code/Model/Recipient/EmailRecipient.php b/code/Model/Recipient/EmailRecipient.php
index c5b9ee7e..5e456e2a 100644
--- a/code/Model/Recipient/EmailRecipient.php
+++ b/code/Model/Recipient/EmailRecipient.php
@@ -103,6 +103,10 @@ class EmailRecipient extends DataObject
         'CustomRules',
     ];
 
+    private static $cascade_duplicates = [
+        'CustomRules',
+    ];
+
     private static $summary_fields = [
         'EmailAddress',
         'EmailSubject',
diff --git a/code/UserForm.php b/code/UserForm.php
index 82540a89..4858b0bc 100644
--- a/code/UserForm.php
+++ b/code/UserForm.php
@@ -125,7 +125,9 @@ trait UserForm
         'EmailRecipients',
     ];
 
-    private static $cascade_duplicates = false;
+    private static $cascade_duplicates = [
+        'EmailRecipients',
+    ];
 
     /**
      * @var array
@@ -161,9 +163,8 @@ trait UserForm
     private static $non_live_permissions = ['SITETREE_VIEW_ALL'];
 
     /**
-     * Temporary storage of field ids when the form is duplicated.
-     * Example layout: array('EditableCheckbox3' => 'EditableCheckbox14')
-     * @var array
+     * Unused property
+     * @deprecated 5.3.0 Will be removed without equivalent functionality to replace it
      */
     protected $fieldsFromTo = [];