does not work, you cant disable the miui camera app.
and to set an other camera as default camera-app does not work too. it still always
opens the stock camera on lockscreen if you swipe left...
Battery drain is a HUGE problem in miui12... My device (Mix 3) was almost unusable I had to charge it twice a day...
I went back to stable miui11 and there is HUGE difference... Now I have to charge once with heavy use and the device feels smooth and fast again... So beta dev has HUGE battery consumption at least two times as stable...
I SUGGEST YOU ALL GO BACK TO STABLE TO GET YOUR PHONE BACK!!!
same issue with k20 pro, the process SECURITY app is draining my battery but just 15% in 8 hrs, i installed betterbattery stats, wakelockdetector but doesnt work very well on miui....