Update src/Config/Parser/MetadataParser/MetadataParser.php

Author: mathroc

src/Config/Parser/MetadataParser/MetadataParser.php

@@ -568,7 +568,7 @@ private static function getTypeFieldConfigurationFromReflector(ReflectionClass $
             }
 
             if (isset($arg->default)) {
-                $args[$arg->name]['defaultValue'] ??= $arg->default;
+                $args[$arg->name]['defaultValue'] = $arg->default;
             }
         }