diff -u b/core/modules/file/src/Element/ManagedFile.php b/core/modules/file/src/Element/ManagedFile.php
--- b/core/modules/file/src/Element/ManagedFile.php
+++ b/core/modules/file/src/Element/ManagedFile.php
@@ -372,11 +372,15 @@
           if ($file->isPermanent()) {
             $references = static::fileUsage()->listUsage($file);
             if (empty($references)) {
+              // We expect the field name placeholder value to be wrapped in t()
+              // here, so it won't be escaped again as it's already marked safe.
               $form_state->setError($element, t('The file used in the @name field may not be referenced.', ['@name' => $element['#title']]));
             }
           }
         }
         else {
+          // We expect the field name placeholder value to be wrapped in t()
+          // here, so it won't be escaped again as it's already marked safe.
           $form_state->setError($element, t('The file referenced by the @name field does not exist.', ['@name' => $element['#title']]));
         }
       }
@@ -384,6 +388,8 @@
 
     // Check required property based on the FID.
     if ($element['#required'] && empty($element['fids']['#value']) && !in_array($clicked_button, ['upload_button', 'remove_button'])) {
+      // We expect the field name placeholder value to be wrapped in t()
+      // here, so it won't be escaped again as it's already marked safe.
       $form_state->setError($element, t('@name is required.', ['@name' => $element['#title']]));
     }
 
diff -u b/core/modules/file/tests/file_module_test/src/Form/FileModuleTestForm.php b/core/modules/file/tests/file_module_test/src/Form/FileModuleTestForm.php
--- b/core/modules/file/tests/file_module_test/src/Form/FileModuleTestForm.php
+++ b/core/modules/file/tests/file_module_test/src/Form/FileModuleTestForm.php
@@ -43,7 +43,7 @@
 
     $form['nested']['file'] = array(
       '#type' => 'managed_file',
-      '#title' => $this->t('Managed <em>@name</em>', ['@name' => 'file & butter']),
+      '#title' => $this->t('Managed <em>@type</em>', ['@type' => 'file & butter']),
       '#upload_location' => 'public://test',
       '#progress_message' => $this->t('Please wait...'),
       '#extended' => (bool) $extended,