Issue #3501810 by tim bozeman: Override mode's render array memory is broken

src/OverrideMode.php

@@ -178,7 +178,9 @@ final class OverrideMode {
       'url' => Url::fromRoute($route, $route_parameters, $options)->toString(),
       'theme_suggestion' => $theme_suggestion,
     ];
-    $variables = $this->addPlaceholders($variables);
+    // This needs to be refactored as it now throws
+    // Deprecated function: Creation of dynamic property Drupal\Core\Template\Attribute::$#override_mode_breadcrumb is deprecated in Drupal\component_library\OverrideMode->traverse()
+    // $variables = $this->addPlaceholders($variables);
     try {
       $bubbleable['#attached']['html_head'][] = [
         [
@@ -189,7 +191,7 @@ final class OverrideMode {
             'type' => 'application/json',
             'data-uuid' => $uuid,
           ],
-          '#value' => Json::encode($variables),
+          '#value' => Json::encode([]),
         ],
         $uuid,
       ];