The issue has been resolved by itself for me. And since many of us aren't experiencing this issue, there's no need for causing more panic among the community. The original post is as follows:
Do not update to the most recent version of WhatsApp. It'll make VoiceOver not to provide any typing feedback, even if you use braille screen input.
I thought it had something to do with my phone itself and restarted my phone. I then tried typing something on WhatsApp with the issue mentioned above not resolved.