The new WhatsApp feature came to improve our experience and contribute to our regret for sending a message we did not want. But if you are one of the curious ones that needs to know what the message that they deleted before sending you said, we teach you to discover it.
First, you should know that when someone deleted a message that you had sent, the message "This message has been deleted" will appear in the chat. Now, to recover that mysterious message, you need an app that registers the notifications that arrive to you.
You can use Notif Log notification history, or Notification History. The two work very similar, what changes is the design. Both register the notifications even if you have already deleted them. You must activate the necessary permissions so that both apps can access your notifications and register them.
Related note: Up to 7 minutes to delete a message on WhatsApp!
To check the messages that you deleted just enter your app and check the record of all notifications that have arrived. Quick and easy.