Issue #3388488: [Symfony 6] Symfony\Component\HttpKernel\Event\KernelEvent::isMasterRequest() is deprecated, use isMainRequest() instead

src/EventSubscriber/OptimizerSubscriber.php

@@ -104,7 +104,7 @@ class OptimizerSubscriber implements EventSubscriberInterface {
     if (
       !array_key_exists('transform_enabled', $this->config) ||
       FALSE === (bool) $this->config['transform_enabled'] ||
-      !$event->isMasterRequest() ||
+      !$event->isMainRequest() ||
       !$this->isAmpHtml($event->getResponse(), $event->getRequest())
     ) {
       return;