diff -u b/core/modules/file/src/Entity/File.php b/core/modules/file/src/Entity/File.php
--- b/core/modules/file/src/Entity/File.php
+++ b/core/modules/file/src/Entity/File.php
@@ -222,7 +222,7 @@
       $filename = Unicode::strtolower($filename);
     }
     else {
-      $filename = $file->getFilename();
+      $filename = $this->getFilename();
     }
 
     return $filename;