Read Receipt

A contact on my list had disabled read receipt, recently I blocked the contact and still i find that my past messages have received blue tick few days ago. Now, I have tried the same with my other contacts, I disabled my read receipt and enabled it 2 days hence but non of the past messages did get a blue tick. How did the person on my contact list manage blue ticks across all my past messages plus the fact that the contact is blocked on my whatsapp?

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