[BUGFIX] Add AsAllowedCallable to ContentWhere

Fixes: #458

Author: nhovratov

Classes/UserFunction/ContentWhere.php

@@ -18,6 +18,7 @@
 namespace TYPO3\CMS\ContentBlocks\UserFunction;
 
 use Symfony\Component\DependencyInjection\Attribute\Autoconfigure;
+use TYPO3\CMS\Core\Attribute\AsAllowedCallable;
 
 /**
  * @internal
@@ -29,6 +30,7 @@ public function __construct(
         protected array $parentFieldNames
     ) {}
 
+    #[AsAllowedCallable]
     public function extend(string $where): string
     {
         $columns = array_map(