New Xiaomi Mi Mix 2S Dual camera not working


Jul 17, 2015
I discovered a bug on 8.7.12. Our Mix 2S has a second camera that is an optic zoom 2x. On chinese MIUI 9 when i press on 2x on the camera the main camera is deactived and the secondary actived. On 8.7.12 instead the main camera remain active also pressing on 2x or manually zoom. I tested on different light condition, but it is still not working.
Is it a Miui bug or a problem on