You're right - that should have happened.
It didn't of course, because the company(-ies) that started the DV issuance didn't want to go back and fix it.
As well as that, if the browser/OS people did 'downgrade' the DV certs, millions of customers by that point would be affected. Assuming they cared about the customers and not the heavy pressure to do nothing from....larger CAs.... ;)
