I'm on Redmi K20 pro and there are some bugs with mail app it keep refreshing and recreating INBOX for Gmail address and keep sending same notifications over and over again and some mail address dosn't work anymore.
There is also a bug with application supposed to be shown over the lockscreen...
In the miui camera app when the phone is in french there are less option to take photo and only access to ultra wide mode ... The app crash and say can't access to the camera when you choose "portrait" mode ... One dev said this was an error of french translation
There is an issue with my redmi k20 pro the camera app work but stuck in ultra wide mode and some mode doesn't work since 2 last versions. All of this worked on 9.6.20 so i'll wait on this version till it fixed