Fix depth to parent selector

src/wagtail_personalisation/views.py

@@ -139,7 +139,7 @@ def copy_page_view(request, page_id, segment_id):
         }
 
         try:
-            variant = Page.objects.get(slug=slug, depth=page.depth)
+            variant = Page.objects.get(slug=slug, parent=page.parent)
         except Page.DoesNotExist:
             variant = page.copy(update_attrs=update_attrs, copy_revisions=False)