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This is the default behavior of unsubscribes in Marketo Durable Unsubscribe - Marketo Docs - Product Documentation
Marketo won't send a non operational email to an email address that matches an unsubscribed email address. Or it's not supposed to.
If a non-unsub record is qualified for a Send, it will go through the flow, but not necessarily receive the email.
Thanks! I didn't realize that was part of the durable unsubscribe. I probably didn't notice due to what Josh mentioned. My duplicates probably qualify and go through the flow steps, but are not actually receiving the email.