We recently migrated to AEM 6.4 and noticed all OOB workflow Email notification body content which also has URL mentioned pointing to local-host URL on all environments (dev,stage, prod)

This was working on prior AEM version we were on (6.1) and We do have OSGI Link Externalizer Config properly setup for all run modes on 6.4

Apart from externalizer, We do have   Day CQ Workflow Email Notification Service (com.day.cq.workflow.impl.email.EMailNotificationService) configured with correct values for Dev/stage/prod but its also not helping.

Can anyone tell if its a product bug or required additional configuration ?