I have the same problem.
Wireless charging stopped working correctly after update.
When i use wireless charging the first notification on the phone, stops charging.
The wireless charing stops working randomly every few minutes.
I don't like people who respond in this way.
Has your post created less spam than if you gave an answer?
I have not found an answer anywhere regarding the possibility of restoring this switch.
What is the last version where it works?
From long time i didn't update my Mi5.
Today I updated it but i have a problem, in current version of i cant find switch to cast screen.
How can I restore it back?
In attachment I marked that switch on screenshot. ( screenshot from Mi6 )