As most (all?) of us here probably come from another phone we are all restoring phone state - some way or other..... maybe there is a reason hidden in the different methods of restoring apps/data ?!
I can tell what worked and what not (although that experience was on original CN/EEA ROMs) on my device:
- BAD: restoring via Xiaomi Backup/Restore is flaky, many apps did not work at all and had to be de- and reinstalled. I also had some pecularities when it came to Bluetooth
- BAD: restoring system apps via tools like Swift Backup is always a bad idea
- I skipped doing this a long time ago
- GOOD: what worked is setting up afresh and using Swift Backup to restore apps (I was rooted, though - makes using Swift Backup easier and allows for batch mode)
- GOOD: restoring apps via Google restore as offered on device setup also worked fine, as it only installs the apps from the play store and doesn't restore any data. I did NOT restore system settings via Google restore, though.....
It would be interesting if we could identify what went wrong on the user's devices reporting issues here, my device works absolutely fine.