fix

Problem:
The RequestSchedulerInterface was not registered as a singleton/shared in the dependency injection container. Because of this, the Engine received one instance of the scheduler, while the RetryMiddleware received a completely different, new instance. As a result, they operated with separate queues.

Author: teandr

src/Core/DefaultContainer.php

@@ -72,7 +72,7 @@ private function registerDefaultBindings(): void
             EventDispatcher::class,
         );
         $this->container->add(ClockInterface::class, SystemClock::class);
-        $this->container->add(
+        $this->container->addShared(
             RequestSchedulerInterface::class,
             /** @phpstan-ignore return.type */
             fn (): RequestSchedulerInterface => $this->container->get(ArrayRequestScheduler::class),