diff -ru src/Extension/CoreExtension.php src/Extension/CoreExtension.php
--- src/Extension/CoreExtension.php	2025-04-24 11:22:29.736583629 +0000
+++ src/Extension/CoreExtension.php	2025-04-24 11:22:30.685585595 +0000
@@ -2089,7 +2089,7 @@
         }
 
         if ($env->hasExtension(SandboxExtension::class) && $env->getExtension(SandboxExtension::class)->isSandboxed()) {
-            throw new RuntimeError(\sprintf('The callable passed to the "%s" %s must be a Closure in sandbox mode.', $thing, $type));
+            throw new RuntimeError(\sprintf('The callable passed to the "%s" "%s" must be a Closure in sandbox mode.', $thing, $type));
         }
 
         trigger_deprecation('twig/twig', '3.15', 'Passing a callable that is not a PHP \Closure as an argument to the "%s" %s is deprecated.', $thing, $type);