When I utilize AsMessageHandler attribute, why does the Symfony debug:messenger command display my messenger handler twice?

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This is because when you use the AsMessageHandler attribute, Symfony creates a separate service for the handler, and this service has its own name. Therefore, when you run the debug:messenger command, you will see both the original service and the new service created by Symfony.

For example, if you have a service named "MyHandlerService" and you add the AsMessageHandler attribute to it, Symfony will create a new service named "messenger.handler.MyHandlerService". When you run the debug:messenger command, you will see both "MyHandlerService" and "messenger.handler.MyHandlerService".