How to disable unread group notifications in Whatsapp?
This issue has been plaguing Whatsapp since its inception. I have had long email conversations with their support team on multiple occasions. Even uploaded a detailed video explaining the bug:
Check it out here: https://www.youtube.com/watch?v=-bldIuA-OjU
This was their reply after about about 20 emails explaining the issue.  

I gave up after that. To anyone reading this, please see the video to understand the problem. If someone influential can publicise it, maybe the will fix it then.