Merge pull request #18185 from craftcms/bugfix/18175-matrix-copy-and-paste

ensure return element

Author: brandonkelly

CHANGELOG.md

@@ -10,6 +10,7 @@
 - Fixed a bug where chip icons were getting rounded. ([#18163](https://github.com/craftcms/cms/pull/18163))
 - Fixed a bug where object templates that included another template were missing variables. ([#18165](https://github.com/craftcms/cms/issues/18165))
 - Fixed a JavaScript error that could occur if two control panel animations were triggered simultaneously.
+- Fixed a bug where it wasn’t possible to copy/paste nested entries within Matrix fields set to the inline-editable blocks view mode, for unpublished owner elements. ([#18185](https://github.com/craftcms/cms/pull/18185))
 
 ## 5.8.21 - 2025-12-04
 

src/controllers/ElementsController.php

@@ -2581,7 +2581,10 @@ private function _element(
                     $preferSites,
                 );
                 if ($element && $elementsService->canView($element, $user)) {
-                    return $this->redirect($element->getCpEditUrl());
+                    if (!$this->request->getAcceptsJson()) {
+                        return $this->redirect($element->getCpEditUrl());
+                    }
+                    return $element;
                 }
                 throw new BadRequestHttpException($draftId ? "Invalid draft ID: $draftId" : "Invalid revision ID: $revisionId");
             }
@@ -2608,7 +2611,12 @@ private function _element(
             throw new ForbiddenHttpException('User not authorized to edit this element.');
         }
 
-        if (!$strictSite && isset($site) && $element->siteId !== $site->id) {
+        if (
+            !$strictSite &&
+            isset($site) &&
+            $element->siteId !== $site->id &&
+            !$this->request->getAcceptsJson()
+        ) {
             return $this->redirect($element->getCpEditUrl());
         }