Of course it's true. Here,
You can as well google it as I mentioned in my earlier message, "miuitr info". I'm using English language as reply because of the rules btw
I'm using MIUITR, it has it's on website and not updated on xda or somewhere else anymore. They are only using their own forum and they have an only English telegram channel as well. We will also receive MUIU13 with Android 10 since dev has Mi6 and made it clear before. Check it out if you are...
It happens to me too almost after every update, I solve it by waiting for update for WhatsApp or reinstalling. If you reinstall, remember to give permissions in Settings/Installed Apps/WhatsApp/App Permissions.