Very serious bugs, hope you seriously, UI MASK script for android mobile phones - XIAOMI didn’t have any effect, there is no way to MASK. Has very many people reflect the problem, from 4.6 began to reflect, I want to know, why don’t you to solve?
Better pose your post as a question or log it using the Unity bug reporter in the editor, you will get more of a response that way.
The forums are not the best place to request issues to be fixed, if you have a query, then provide some background to what you are setting up and what you are seeing, then community members (or Unity staff) will offer to help if they can.