Pass $resolved as False for arguments to toPlainObject()

IcingaArguments passes the $resolved through to the individual argument in the toPlainObject. There lies the error,
simply pass false - because the argument itself cannot have any parents and therefore cannot be resolved

library/Director/Objects/IcingaObject.php

@@ -2826,7 +2826,7 @@ abstract class IcingaObject extends DbObject implements IcingaConfigRenderer
 
         if ($this instanceof ObjectWithArguments) {
             $props['arguments'] = $this->arguments()->toPlainObject(
-                $resolved,
+                false,
                 $skipDefaults
             );
         }