I think you shouldn't look for the firmware on which the sensor will work normally. Such a trifle as a sensor in a phone for 560 euros must work properly from the beginning in stock rom. There is no official support for xiaomi phones here, write about this issue on official mi.com. Or contact an authorized service center with this problem.
I am using Mi12Pro China version flashed latest EU ROM but proximity is also not working. Using built-in Control and Identification Toolbox (CIT) to test the sensor but it is not responding . maybe the sensor is not exist , isn't it ? Now I know how to test the proximity sensor on xiaomi phone. Don't place your phone on the table. Take it

- Fixed proximity sensor not working - Fixed battery percentage drop after reboot - Improved signal reception - Fixed rounded corners - Fixed autobrightness (flickers) - Fixed FaceUnlock - That's all folks

Restart your Device: If the Proximity Sensor suddenly stops working, the foremost thing you can do is to switch off the device, wait for some time and switch it on again and check if that works now, as there can be a simple software glitch.
If the proximity sensor suddenly stopped working out of the blue, you can use this method as it could be a software glitch. Simply put your phone to shut down, wait for a few minutes and turn it ON. Check if the proximity sensor on your phone is working or not.
To do this you have to do the following: Access your Xiaomi settings. Go to "Phone information". Click five times on "Kernel version". Now on the telephone keypad enter * # * # 6484 # * # *. The CIT menu will automatically open. This menu has several sections, in the most basic versions of MIUI you can access the sensor information by It has been observed that phone's proximity sensor is not working and screen is lit and it doesn't turn off during phone call. May guide how to resolve the issue so that screen will be turns off during phone call. Answers. Proximity Sensor - Xiaomi Redmi Note 9.
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    • proximity sensor not working xiaomi