It's probably a bug. I connected my keyboard with my phone via an otg cable to play minecraft using it. But the problem is WASD keys cannot be used for movement although all the other keys works just fine I can open inventory using E. However if I want to move I have to use arrow keys. And if I try to register any alphabetical key for movement control it won't work. I just have to use the arrow keys which is quite annoying. So hopefully this will get fixed.