Hi. The automatic brightness, the calendar icon and the telegram notifications work well for me ... I do not know if it will have something to do, but I did a dowgrade of the last beta to this stable without making a wipe data.
Hi.
If you have root privileges, it is easy to change it, you just have to edit the file "build.prop", modify the value in "ro.miui.region" for your region.
Greetings.