I can’t think of any condition for this to happen, the query used to pull the messages to send explicitly checks for a specific message status to send, once sent they no longer have that status (otherwise EE would continually send them).
Do you create full site backups? If so do you have one from before you ran the update?
Or if you have a database backup that I can install locally so I can run the update and catch any requests to wp_mail which may highlight why this happened?
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