Поправил сигнатуру

src/Service/Transformer/Request/Headers/Header.php

@@ -12,6 +12,6 @@ class Header extends ServiceMeta
         public ?string $default = null,
         public array $tags = ['request_headers']
     ) {
-        parent::__construct($tags);
+        parent::__construct($default, $tags);
     }
 }

src/Service/Transformer/Request/Server/Server.php

@@ -12,6 +12,6 @@ class Server extends ServiceMeta
         public ?string $default = null,
         public array $tags = ['request_server']
     ) {
-        parent::__construct($tags);
+        parent::__construct($default, $tags);
     }
 }