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diff --git a/web/core/modules/system/tests/themes/test_theme_settings/theme-settings.php b/web/core/modules/system/tests/themes/test_theme_settings/theme-settings.php
new file mode 100644
index 000000000..7f3c1395f
--- /dev/null
+++ b/web/core/modules/system/tests/themes/test_theme_settings/theme-settings.php
@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * @file
+ * Test to ensure theme compatibility with managed files.
+ */
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\file\Entity\File;
+
+/**
+ * Implements hook_form_system_theme_settings_alter().
+ */
+function test_theme_settings_form_system_theme_settings_alter(&$form, FormStateInterface $form_state) {
+  $form['custom_logo'] = [
+    '#type' => 'managed_file',
+    '#title' => t('Secondary logo.'),
+    '#default_value' => theme_get_setting('custom_logo'),
+    '#progress_indicator' => 'bar',
+    '#progress_message'   => t('Please wait...'),
+    '#upload_location' => 'public://test',
+    '#upload_validators'  => [
+      'file_validate_extensions' => ['gif png jpg jpeg'],
+    ],
+  ];
+
+  $form['#submit'][] = 'test_theme_settings_form_system_theme_settings_submit';
+}
+
+/**
+ * Test theme form settings submission handler.
+ */
+function test_theme_settings_form_system_theme_settings_submit(&$form, FormStateInterface $form_state) {
+  if ($file_id = $form_state->getValue(['custom_logo', '0'])) {
+    $file = File::load($file_id);
+    $file->setPermanent();
+    $file->save();
+  }
+}