How do I split queues in Symfony Messenger?

Could you please explain why, when launching the indexing process using the command $this->bus->dispatch(new ProductIndexMessage($productIds)) (with hundreds of such commands being executed at once), they are evenly distributed across all transports and queues? According to the design, they should only be launched on the searchIndex queue.

PHP: 8.4.5, Symfony 7.2

/usr/local/bin/php -f /var/www/html/app/bin/console messenger:stats
 ---------------- -------
  Transport        Count  
 ---------------- -------
  async            40     
  searchIndex      40     
  genImageThumbs   40     
  failed           6      
 ---------------- -------

File:

<?php

declare(strict_types=1);

namespace AppMessageSearch;

use AppMessageSearchIndexMessageInterface;
use AppUtilsUtils;

final readonly class ProductIndexMessage implements SearchIndexMessageInterface
{
    /**
     * @var int[]
     */
    public array $productIds;

    public function __construct(int|array $productIds)
    {
        $this->productIds = Utils::asPosAndNotZeroNotDupIntegerArray($productIds);
    }
}

There is a configured messanger.yaml:

framework:
    messenger:
        failure_transport: failed

        transports:
            async:
                dsn: '%env(MESSENGER_TRANSPORT_DSN)%/async'
                retry_strategy:
                    max_retries: 20
                    multiplier: 2

            searchIndex:
                dsn: '%env(MESSENGER_TRANSPORT_DSN)%/searchIndex'
                options:
                    exchange:
                        name: 'searchIndex'
                retry_strategy:
                    max_retries: 20
                    multiplier: 2

            genImageThumbs:
                dsn: '%env(MESSENGER_TRANSPORT_DSN)%/genImageThumbs'
                options:
                    exchange:
                        name: 'genImageThumbs'
                retry_strategy:
                    max_retries: 1
                    multiplier: 2

            failed: 'doctrine://default?queue_name=failed'
            # sync: 'sync://'

        routing:
            SymfonyComponentMailerMessengerSendEmailMessage: async
            SymfonyComponentNotifierMessageChatMessage: async
            SymfonyComponentNotifierMessageSmsMessage: async

            # Route your messages to the transports
            AppMessageAsyncMessageInterface: async
            AppMessageSearchIndexMessageInterface: searchIndex
            AppMessageImageGenThumbsMessageInterface: genImageThumbs

Commands to start workers:

/usr/local/bin/php /var/www/html/app/bin/console messenger:consume genImageThumbs --limit=1500 --time-limit=86400
/usr/local/bin/php /var/www/html/app/bin/console messenger:consume searchIndex --limit=1500 --time-limit=86400
/usr/local/bin/php /var/www/html/app/bin/console messenger:consume async --limit=1500 --time-limit=86400