Hi, I am dealing with same problem on my Mi9T phone.
What I recognized, there’s a problem probably with communication between camera app and hardware - I suppose, that problem is either with motorised front camera, or with the wide lenses.
The problem for me disappeared in few latest versions (up to 1.6), but in the new version (I am using 1.81), which I installed few days ago, is unfortunately back.
In addition, this problem also affects the use of Signal app, where I cannot open any message (probably some background communication is connected to camera). Here is my older case, where I tried to solve this.
I will look into log file, if there is some useful informations - hope that some programmer could help 