yes, stable always had notifications broken for miui11 ,
there is not much you can do other than install 3rd party mod (mi-globle) - it will show three dots if there is more than one notification. though in your case i don't know there are no notifications at all.. just go to the status bar settings (type status bar in settings search) and enable the icons for notification bar.
as for the mi globe notification mod, you flash it on twrp. but make sure u flash compatible version specific to your release rom.
also, take a backup of the system file it replaces, so u can revert in twrp. they have a disable mod, but it doesn't always work.
path for the system file to back up -
\system\priv-app\MiuiSystemUI\MiuiSystemUI.apk
(don't forget to set permission to 644 if u manually copy it in twrp)
here's the link (remove quotes, forum has filter)