This setting will be missing if there's some problem with one of the required sensors on your device, like a damaged persist partition.
Since @minotavros has Mi 9 Lite and this setting, it means it's an issue specific to your device.
Try making a log using this command:
adb logcat -s MiuiPhoneUtils
Thread has been cleaned from the usual nonsense. For those who have understanding problems:
1) Write only in English. Post in any other language and it'll be removed. Continue this way and you'll get banned.
2) We don't care how impatient you are regarding Mi 10/Mi 10 Pro/POCO F2 Pro. We already...
Looks like an official issue, I found reports with the same issue I'm having since MIUI 11...
So, report directly to Xiaomi, I couldn't find the problem.
Added to official issues: https://xiaomi.eu/community/threads/weekly-confirmed-issues-faq.46800/
I don't get insider information from Xiaomi, but we don't expect any Android 11 for any of the Mi 8 series devices.
I don't know where the problem comes from so there is no fix...
Don't know, I'm not the one building the ROMs, ask ingbrzy.
No, the final Stable for mido was V10.2.2.0:
Confirmed, patched for next week's release.
Can't reproduce on Mi 8 and don't have a Mi 10 Pro for testing, but we don't support outdated weeklies anyway. You'll have to wait for a usable Android 11 Weekly ROM.